Take it to a shop and get it aligned. The End.
Seriously though, most people don't have the proper equipment to do a good alignment (you can do it with very basic tools if you really know what you're doing, but that's another story), and being out a degree or two can make a big difference in your car's handling. A shop can do a 4 wheel alignment for (usually) $60-80 and get to whatever numbers you ask for provided your car isn't horrendously slammed.
So why do you need to adjust your camber? Just curious if you lowered the car, or if someone told you to do it, or what.