I didnt take every last little step by step. I had a close idea how to do it and just knew what needed to be done. one thing is though, find a friend thats a painter. go in the booth with him one day. and watch him do a car, it'll help you so much more.
first your going to have to do the body work, align moving parts, fix dents patch wholes, shave what you want shaved. I sanded the whole body down with 220 sand paper. wash the car, let it dry and dont touch with your bare hands, you have oil on your skin no matter what. if you get that oil on that car and you spray, theres a good chance it wont stick.
I sprayed 2 coats of primer. Gray primer for a lighter color, red primer for a darker one.
After each coat I sprayed of the primer, i lightly hit it with 220 paper again. after sand down, took a wet rag, wiped it down, let it dry. Sprayed another coat.
The paint was basically the same way, spray, sand, clean, spray, sand, clean. you just have to be careful as well. like if your paint is shooting webs, then you need to thin your paint more. too much thinner and your paint runs, too little and it shoot webs (looks like spider webs)
the clear coat was fun because I kept messing with it. like putting too much flake in the first coat of clear. second coat, i didnt use a strainer and got trash thrown through it. the 3rd coat i did everything right on it. and got better results. (of course) Im no pro though. but these are just some of the things I've learned by watching and asking questions alot.