Remote Keyless Entry

I have a 1995 Oldsmobile Eighty Eight that I bought used. Found out from a dealership that I have a factory installed keyless system, but the original owner did not turn in the remote fobs when traded the car. Recently, I bought some remotes from ebay, but I dont know how to program them. I have called dealerships and was told it will cost $35+ to program. I would prefer to program myself. Anyone have any directions?

Reprogramming the remotes has to be done by the dealer because you
need an instrument known as the scan tool to do the reprogramming.
This item is very expensive ($350-400) for occasional home use. It's
a better idea to have the dealer do the job.