I read and bookmarked everything I could get my hands on for a few weeks leading up to the swap. Lextech also helped a ton, I'd suggest pm'ing him. I used my original harness and added the wires that weren't there using the donor harness so I didn't have any cuts or splices. It really was easier than I thought it would be. As for cost, I bought a complete running and driving rolled tahoe so I had everything at my disposal. So, headers, motor mounts, fuel line adapters and the a/c relocation from lextech were really the biggest things. Then there all the little stuff, fluids, filters hose, new gaskets and that kind of stuff. I'd say a guy could easily get it done for 500-800 minus engine. I'm afraid to add up what I have in it so I couldn't say for sure.