The processor will be stuck onto the heatsink when you take it off. There isn't alot you can do to guarentee the CPU to stay in the socket, but run the PC for a while on full load (an hour or so.) and then quickly open the PC up, and slowly lift the heatsink off. If it doesn't come off (needs some force) than if you can open the lock on the CPU then do that, and take the processor off.
Make sure you lift upwards and not at a angle.
Cisco CCNA, Comptia A+, 1/3 through CCNP