I've tried the recommended cocktail stick method a number of times, I'm not a fan to be honest, the touch up is not that neat & you will struggle to get an even coat across the chip.
I now use a very fine artist brush, bought from Hobbycraft, this simplifies the job and the results are much better than when using a cocktail stick.
In regards to loading the paint onto a brush, I use the original touch up brush to put a drop of paint onto an old credit / loyalty card and very lightly dip into this to load exactly what is needed for each chip.
As you put the paint onto the card, it will be very thin and difficult to load in a bubble form onto the brush, this will quickly start to thicken as it mixes with air, there is a perfect time to use the paint just after it has slightly thickened enough to load onto the brush, but is not thick enough to drag. As soon as it thickens to the extent of pulling like a string when you dip into it, drop a new dot of paint and start working from that.
Don't know how many chips you have, but if there are a number, start at the chip at the highest point first, so that your not likely to lean your hand into the section whilst touching up another chip.