I was quoted 10 hrs. of labor from a popular supra speed shop. That included remote bottle opener, bottle heater and testing with a smaller jet then to the larger jet. Another small place, I didn't have too much confidence in, quoted $300 for the whole install. I decided not to have it done in the end (too many miles on my motor to risk having a blown head gasket).
The kit should cost about $50-$100 to install and NO MORE THAN That. You can look on "legendtuner" I think and there is a pretty detailed outline of how to install it yourself. It is not that hard to install (unless you are installing the Venom 200, it is a little more tricky)
Good Luck, and take pics of how you install it (step by step) as I am going to install mine this fall (so I don't kill myself in the summer)