HunBun, yet again I can give you my accumulated wisdom about PC's. Ignore the advice of those illiterates (Craven: Debbie=Bunny, remember? The guy's just setting you up again).
Now, first remove the hard-drive from your machine, it looks just like this;
Now brace it against something solid, like a Bessa block or a concrete brick or even put it in a vice, squeeze that sucker in reeaalll
All set? Good.
Next bit requires the use of a sophisticated piece of equipment;
Think you get the picture.