Definetaly get Masterskinners' pro-kits they help you a lot.
open your favorite music, get in the mood lol
and a more useful tip: when you are working, resize the skin 1280x1024 (or if you working on 2048s, resize it 2560x2048), make your skin, then resize it back to 1024x1024 then save as a JPEG file. You may realised that cars on LFS are not "square" they are more stretched. and when you work on a "square" skin, the result will come out stretched in the game. So before all of this crappy stuff
you can stretch the blank skin and resize your final stuff back to square to get the most realistic result.