I have the FOP32-1, which is the same heatsink that you have, only with a smaller fan. Anyway, first i put some heatsink compound on the die of the cpu (i assume you know how to do that and have already acquired some, if you haven't, you can get it at radioshack). Now attach the clip to the nub on the far side of the socket. Then use a screwdriver to push on the opposite side of the clip, since it takes so much force that it can hurt your fingers terribly. Then simply use your other hand to move the clip into place while you use the screwdriver to push it down. That should work fine, it worked for me anyway!
Does that answer your question??