They are generally held in place with a spring clip. All you have to do is move the spring clip and the battery comes out easy. Apparently there is a cmos clear button on the motherboard. There is a large black heatsink in the centre of the board and just to the left of that and above the two small motherboard slots. The reset button is there.
You have no choice but to put thermal compound on. If you do not, you will destroy your processor. Period.
So do I just need to push the clear cmos button?