It's as easy as unscrewing the plug at the bottom. Unscrew the top, get a pan under the bottom, and unscrew that bolt. Check out singh5g's awesome video on this exact process and all your questions shall be answered. He's got a good trick to keep your tire from getting oil on it. He's got other great vids too.
http://www.youtube.com/watch?v=eY8F-J0ej2QOne tip, if you don't have a measuring cup to dedicate to oil then try this:
-Use a kitchen measuring cup to measure out the amount of oil you are going to put in by using water. Snidal manual says 265ml.
-Poor that water into a glass bottle or other clean container you don't care about.
-Draw a line with a Sharpie where the water level is.
Now you have a way to measure out your oil.
A few things to watch out for: The rubber o-rings at the top of the forks could be worn out; They were on mine. Got replacements at the hardware store. If your bottom bolt washers get trashed you'll need new ones too or you might get leaks. I don't know what others use, but I have Yamaha crush washers that I got at a bike shop. Bare has suggested an aircraft website for washers... check my recent "bouncing front end" thread for the link.
Boggy