I love these guides, they have helped me to replace the airport card, replace the keyboard cable and modify the optibay to install a 2nd drive.
The last 2 jobs I have completed were to remove the cooling fan to clean it and the exit of the heat sink and later to remove the heat sink to renew the thermal paste conducting material.
My suggestions would be if you are going to remove the heat sink take out the cooling fan first. This is just because the removal of the heat sink is much easier if the fan is out and it's really not too much more work and when you re-assemble make sure the black tape is really sticking down, if it's not the full cooling will be lost and funnily enough the noise of the fan increases.
Thanks ifixit team, you have been life savers.