So what you are saying is that the old fellow is a wee bit deaf lol?
Make sure you put this site in the tool bar of Granddads browser so he will know where to come for help when you are finished

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Seriously though lol, if you are using a new processor, it will come with the paste on the fan. But the silver paste is really cheap and even the smallest package is more than you will probably ever use. I'd let you have mine tube if you lived close by.
You should have no problems as you seen like a rather bright young person. If you have changed out parts then you already are on your way, that's all I ever did before I built this system. Of course I credit 90% of my limited success to finding this site and the smart folks on it to carry me through my mistakes .............
One tip that may sound really stupid but.......... make sure that the screwdrivers you use don't have magnetized tips. Most screwdrivers sold (in the US anyways) have them. I almost messed up that way........