SMOKEU, is that going on the system in your sig? If so, it shouldn't be too hard.
Take the back plate and the 4 riser screws and install the backplate to the board with the 4 riser screws. Tighten them down good, then take the chrome top plate and put it on the riser screws, then tighten that down with the 4 chromed knurled nuts. After doing that, apply your thermal grease to the processor IHS, then take the crossbar and set it on top of the heatsink base and lower it on top of the processor. Start the threads on the crossbar screws on 1 side, then the other, then alternate tightening them down until the threads bottom out. Then you can carefully use the wrench that comes with the heatsink to tighten the knurled center screw of the crossbar to give even more clamping pressure if you want. And the link Lenny provided does give some good pics of what I am describing too.