Easy fix for dirty pot?

Hi guys,

i have an 800xl that is having an issue with keeping its color.  Sometimes the color is normal, but other times the color goes into black and white.

I was talking with others here and they mentioned for me to try to insert a screwdriver into the hole in the bottom of the unit, and see if that affects the color.  If it did, it could be a dirty pot.  I did so and that definitely seems to be the issue..... when i even TOUCH a scewdriver into the hole, my color flickers like crazy.

So, my next question is, is this possible to fix for someone who really is not a technie at all, and is leery on even opening up the unit?  I'm just afraid i will end up breaking it more than fixing it.

thanks guys,
Slyde