Discipline? Mostly just pain. Trying to make somebody learn photography through using film is kinda like making them learn how to write software with BASIC on an Apple //e. Hey, it worked for us. What's the matter with you? Kids these days, don't appreciate how hard we had it back in the day.

The single piece of advice I give people is to just shoot an awful lot of pictures, since the marginal cost of taking a digital picture is zero. The more you shoot, the more you can develop a critical eye with your own work.