Silentstrike,
Hi there. I just recently built an Athlon 1.1 ghz system with a socket A motherboard, and got it up and running 2 days ago. I had absolutely no problem whatsoever installing the processor. I set it in position, and it slid right in. Then while keeping a finger on top of it with gentle pressure, I lowered and locked the lever. Be sure and test fit your heatsink/fan unit a few times before actually mounting it permanently. You'll have to push it down with a little force to compress the little rubber feet that the Athlon processor has mounted on top of it. These are there to keep the heatsink from shifting and shorting out something on top of the processor. Don't push down too hard, or you could accidently crack the processor. According to what I've read, it's supposed to take alot of force to break the T-bird, but I've heard it has been done. Lock it in place, keeping it centered. Then check the mating surface between the heatsink and the processor. Do this carefully. The processor can burn down in seconds if there is even a little gap in there. Once you are sure you've got a good fitup, add your thermal compound, and install it permanently. If for some reason you aren't satisfied with the fit, don't run it that way. I hope this helps ya out.
If you have any more questions, I'd be happy to help if I can.
Phil
by the way.. this was my first socket A system too. Good luck!