'02 Chevy Silverado Keyless Entry

I have a '02 Chevy Silverado that has factory power locks and I'd like to add keyless entry. I can get the parts from the dealer, but he tells me I'll need to reprogram my body control module. Does anyone have any experience with installing keyless entry and reprogramming the BCM or is this something only the dealer can do? Any suggestions would be greatly appreciated.