98F150/GT

I have a 95 mustang gt and a 98 f150 and neither has keyless entry, i was just wondering if anyone has ever installed one themselves on here and what you needed. Im just looking for something to operate the locks on either one i dont care about an alarm really, i live in the boonies lol. has anyone ever taken their car to a place to get it put on, if so how much did it cost and where? Thanks guys!