Anyone have any good NDB approach tips and tricks?

If you don't have MS Flight Simulator or something similar, try Tim's Air
Navigation Simulator:

http://www.vrotate.com/VOR/vor.html

It doesn't simulate the airplane control part, but you can set the positions
of two navaids (VOR or NDB), and the wind, and see how the needles move as you
navigate and track different courses.

Barry