First use some silicone/wax remover, dry it off and you're ready to stripe. If you don't trust yourself with a striping brush, get a roll of 1/4" 3M fine line tape. Once you get the first pass of tape on the body, the second pass is easier since you have the first pass to use as your guide. Space the two passes whatever you want, usually 1/8". I would still use a pinstripe brush because it carries a lot of paint so you can run a long pass without reloading the brush. If you have to make some tight curves, use the blue fine line tape.
Make sure to put a drop or so of Smoothie (fisheye eliminator) or similar product in the paint. If you use One Shot Lettering enamel, (comes in 1/2 pint cans, lasts forever) you won't need to add much, if any thinner. It is never necessary to clearcoat One Shot. It can be done, but it is very risky due to the fact that the stripes may check from the clearcoat.
Good Luck to you......................
Lastly, make sure to remove the tape very slowly right after you apply the paint so the taped edges will level off giving it a hand striped effect.
I have been striping for nearly 60 years and this method never fails.