In my opinion the simplest delay box to use is this one...
http://www.jegs.com/i/Dedenbear/302/CO2/10002/-1
There are alot of flashy boxes out there but this one is SIMPLE! A good friend of mine was in about your situation and we set up one of these in his car and he didnt have any issues operating it. Most of the other boxes are digital and have alot of settings that most dont use, my new delay box came with a 20 page instruction book. I think the dedenbear one comes with 1 or 2 pages of instructions...