You honestly shouldn't have to, but many folks have messed around with the application and posted results. The best methods have been:
1) normal application of TIM on CPU, apply direct contact heatpipe cooler. Done.
2) apply some TIM to the cooler, ensuring application in the crevices of the heatpipes and block. Clear excess with a razor blade. Apply TIM to CPU spread with razor blade or finger inside a plastic baggie to disperse in thing layer; mount direct contact heatpipe cooler.