If you have any sense in your head, the repin is very easy. (granted I can't say my harness works yet
) The hardware kit and sensors run you bout $600, and the repin kit is a $100, then you need a LS1 pcm, coils, and coil harnesses. I am doing it on my build, just strictly because finding a competent LT1 tuner is entirely too difficult these days.
I would make them tune it, if they said they could then don't let them get out of it.