Biggest tip is don't be scared! I believe if you read enough, think carefully, and go slow, anyone can end up with a straight, rideable bike using minimal tooling. At least as good as an off the shelf frame, but with the benefit of having enjoyed the process of making it. Keep in mind that despite the way frame building gets talked about, these things don't need to be built to aerospace tolerances. In the end, its "just" a bicycle.

I found this little clip really inspiring when I was teaching myself:
http://www.youtube.com/watch?v=TMA8X5pk2kI

The part at 3:20 when he checks alignment of the seat and headtubes by eyeball....super accurate and completely free. They don't need no stinking jig or new fangled alignment table!

Have fun!