Very little, almost none. They are ZIF sockets (Zero Insertion Force Sockets) and the processor should just drop into them. If the don?t want to go in a very, very small tap with one of your fingers should do it.
Check to make sure there are no bent pins on the processor. I friend of mine dropped his Duron 650 at the shop and bent about 40 pins. We tried to get it in the socket but it wouldn?t drop in so we just got a pair of very small pliers and bent them all straight.