I performed this procedure to replace the fan/heatsink assembly, and used the HP maintenance and service guide for this machine which can be found at http://h10032.www1.hp.com/ctg/Manual/c03... - it differs from these instructions (an improvement) is two ways - first, the optical drive should be removed before the keyboard, and then the keyboard can be pushed up from below to get it started, which is much better than forcing the whole thing from above. Secondly, removal of the top cover does not start with separating the front edge as these instructions show, but by lifting the back edge and then sliding the cover forward, which takes very little force. The Ifixit instructions were a good start, but I was glad I had the real stuff from HP.
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