velomancer:
Here's a video of the basics of Wheel-Truing:
http://bicycletutor.com/wheel-truing/
I'll only add: If you tighten one coming from one side of the hub - loosen an one from the OTHER side of the hub RIGHT NEXT TO IT. Always work with a pair of spokes - One from <-- this side. One from --> this side ACROSS from the other. If you don't quite understand, ask us to clarify.
You can do this. It's not rocket-science.