'05 Tacoma Trailer Wiring?? Help???

I bought a new '05 4X4 Tacoma last Thursday. I installed a REESE hitch yesterday and went to put the plug for the trailer lights on and WOW.......A LOT of wires back there. I had a '92 Chevy S-10 and when I wired it, it was only a few wires to probe to find the right ones, but this Yota is LOADED with them. I am afraid to stick them because I don't wanna short anything out. I can get it done "professionally" for about 50 bucks, but thought someone may give me some insight and save me the $50. Gonna need it to fill it up with gas:).

Thanks in advance!!