Only thing that differs as far as I'm concerned is that I found it more difficult to get the 120 film into the spiral than the 35mm. After the first couple of rolls, i'd worked out a technique that works for me, and now it's easy with either film.
The best way to learn is with an old fogged spool of film. Do it with your eyes open a dozen times, another bunch with your eyes closed and again sitting and standing.
It helps if your spiral is completely dry and the ball beaings smooth and rust free. 120 is slightly more flexible because of the greater film area.