I've been servicing my cars since I was a young lad, but gradually did less and less and stopped completely about ten years ago due to a combination of age, health, and order circumstances.
You'll be surprised how much you can get done on your drive, though some things will take longer and will be more awkward to get done without a lift and a full set of garage tools. But you can invest in some 'prosumer' tools and in a pair of ramps to make things easier, for example. And, safety, especially while working under the car, should be your number one priority. You should also get yourself a good proprietary scanner e.g. iCarsoft. Ultimately, the majority of tasks are doable DIY.
With regards resale value:
Firstly, keep in mind that buyers only check service history, not repair history. You can have the scheduled services done by a garage who will stamp the book (digital or physical), then do everything else yourself and the buying public will be none the wiser. This includes replacing discs and pads, dampers and suspension components, engine parts e.g. thermostat or sensors, the list is long.
So the question of resale value only applies to the bare minimum i.e. the manufacturer's scheduled services.
On a newish or high value car, personally I'd stick with dealer or indie service, keeping the official digital service book updated.
On older or mid-range value cars, I'd just keep the receipts for the service parts (oil, filters, etc) as proof, and keep a log of what was done to the car and when, most buyers at this tier will be happy with that.
If I was going to keep the car forever I wouldn't bother with any of it, but still keep a detailed log for my own records.
Good luck. Servicing and repairing your own car can be very rewarding at times (and frustrating at other times)...
I haven't used main dealers in a very long time , but at one point did use what I thought were trusted local garages or independent specialists .
I have to say that of various places I've gone the ONLY one I would have 100% confidence is Merparts in Port Glasgow , but they are not exactly cheap . With all other places I always leave my cars with some misgivings and a degree of mistrust , having experienced some horrible bodges at the hands of garages at one time or another . One notable instance was when I put one of my W124s in for an MOT ; this was a car maybe 5 or 6 years old at the time and which I'd bought as a 3 year old used car from a main dealer not so very long before . Anyway I was told the brake pipe front to rear was corroded near the back , so told them to go ahead ; after picking the car up and getting home , I noticed the four lights in the cargo area were on , and they wouldn't turn off with the switch ; then I discovered the tailgate closure wasn't working either . Knowing what had been worked on , I got down on my knees and looked under the car : instead of the original fasteners , which are plastic nuts run onto metal studs coming out of the bottom , the pipe clamps had been rescued by a row of shiny self tapping screws , on removing these the fault cleared ; lifting the carpet in the rear floor area , it was evident that the screws had been driven right into the wording harness . As is my way with such things , I never go back to complain , which is only stressful for me , and having had my car bodged once I'd never be confident it was fixed properly ; instead I went to the dealership ( in one of my other cars ) bought the correct fasteners and fixed the problem myself ; I also cleaned up around the unwanted holes , undersealed and put in some small rubber grommets . When something like that happens I just make a note and never visit the establishment again .
My main point is that if I want a job done right , I do it myself - this is the strongest argument for doing your own servicing and repairs , workshop manuals are easy enough to come by and for most routine jobs it is easy to service cars yourself , and even repairs like replacing brake pipes , which I now always make up and flare myself out of CuNiFer pipe ; I also have a vacuum solo bleeding kit which runs off my air compressor and I can do this without needing help ; although with my son now being 15 it is about time I started to teach him some vehicle mechanics since he is starting to show an interest .
DIY servicing CAN save you money , and I also take the notion that I grudge paying someone else to do a job that I can do perfectly well , and probably better , myself ; but the main reason is not financial , it is primarily that I want to know my cars haven't been bodged and that all jobs have been done correctly .
Also , none of my cars have OBD , although I have learned to read blink codes and clear stored codes simply using some bits of wire and my trusty AVO meter 8 , on which I can count the kicks of the needle ; but you don't have to go that far back not to have the OBD2 sockets - none of my W140 , R129 , W124 , W201 or W126 cars had it ; it was all blink codes and I don't think of them as old cars in the way that I thought about my Ponton and Fintail .
While I don't yet have a driveway at my new house , although I've taken down the front wall to create one - next year - I have built up a reasonable collection of decent tools and equipment down the years and can tackle most things . I currently have a list of jobs for my recently bought S124 : fit tow bar , retrofit cruise control and OTG ; put in better audio system ( still looking for rear door cards with optional speakers in the rear armrests , then get rid of ones in the tailgate put there by previous owner ) , fix electric sunroof ( I have already determined that one of the lift arms has broken - easy job ) and since I have found a donor car with air-con , I'm contemplating retrofitting A/C using most of the system from the donor car but some new components as required ( I plan to strip what I need from the donor car and keep until I have a drive to work on ) .
