The Graphics Card is relatively simple to remove. If you're somewhat confident then by all means follow these instructions. At your own risk, of course:
First, adhere to static discharge precautions. This means touch a radiator and / or the metal parts of your PC case to make sure your body's electrical charge is as close to neutral as possible. This is to ensure you don't 'zap' your PC components with a potentially harmful static shock.
Ensure your hands are as clean and grease-free as possible. It's a minor point but good to be clean.
Next, remove your PC's power cable, so you don't electrocute yourself. Make sure your Power Supply's switch is also set to 'off'.
Open the case, remove the PSU Power cable attached to your Graphics Card (Press the plastic 'tooth' to allow it to detach from the card). Set the cable somewhere you can easily identify it. It should say something like
PCI-E x16 on it and have 6 pins on the end.
Unscrew the screw(s) that are securing the Graphics Card to the PC's case then firmly grip the Graphics card and gently 'wiggle' it out of its slot.
Place the Graphics Card somewhere it isn't likely to develop a large static charge. Somewhere like on top of some newspaper, on a glass or laminated wood surface, etc. Make sure the cooling unit is face down and the Printed Circuit board is face up.
You should now be able to access your CMOS button / CMOS battery.
If you need to move around a lot on a carpeted or high-static surface then repeatedly touch a radiator or your PC's case just before handling any components.
Reinstalling the Graphics Card simply involves repeating those steps in reverse. When placing the Graphics Card into its slot apply firm pressure along the spine of the Printed Circuit Board to ensure it's firmly back in place, not at a slight angle.
Here's a guide with pictures:
http://www.wikihow.com/Change-a-Graphics-Card
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