2003 sable remote programming

Hello,

Recently purchased a 2003 sable gs. Got it for a great $$$ but drawback was that the dealer only had 1 key and 1 remote...

I'm thinking of buying 2 remotes off ebay but I'm afraid to do so because ad says "should work" and "will send programming instructions"...

Now I have seen that others here have programmed remotes for older model sables - anyone know how to do this w/a 2003?

Thanks