Hey Dan,
I really don't want to piss on your chips, but you've picked a really difficult road to go down. First barrier is your age..At 33 you are considered very old! I'm 36,and just recently got out of being a mechanic/MOT tester because it was taking its toll on me-10 hour days,6 day weeks,heavy work and no heating in winter, most mechanics of my age move on to something else,or move up to management etc. 33 in Fast fit would be torture! You see very few older fast fit guys, and to be honest the 17 year old lads run rings round ya! Been there too...
I tell the young lads I teach now that electronics and diagnostics is the future- this really is the path to go down..Its getting to a point where independent all makes garages are really struggling to cover all marques,and specialisation is the key to the future,cars change so quickly,and the equipment is so frequently updated at huge costs that it just isn't viable for a smaller garage to have everything they need.People like Frank Massey run intensive diagnostic courses. They cost a fair bit but you will learn SO much. College is a start but they obviously wont have dedicated diagnostic equipment etc so you will get a grounding, but theory and practice are miles apart sometimes!
My advice to you would be: Go to college if possible and do a diagnosic type course. Learn,learn learn. Websites,forums,books anything. Knowledge is all in this area. If you think self employment would suit, get a van, diagnostic gear and sell your sevices to the trade and public. If you don't fancy that idea, try and find garages in your area that specialise in this field and pester them for employment. There is a definite shortage in this area,as has been said above.
Think about it. Do you really want to be standing one morning in a freezing cold garage, with filthy overalls on,lifting out a 1996 Mondeo gearbox..gear oil running down your sleeve,dirt in your eyes,with a Citroen Xantia sitting outside needing a clutch-before 5PM..
Or be sitting in a Merc, in your immaculate dustcoat,on a laptop?....for more money?
Best of luck to you, but the best thing I ever did was get out!!