I used to have a set of Weyless rollers. These had a set of steps/platforms attached on each side, making it trivial to put a foot down when you felt you were about to fall off on a side. It was quite nice to not worry about falling 4 inches before you could put a foot down!
I had the benefit of some tutelage when learning to ride rollers. For those not so fortunate, the old Cyclo-Pedia catalog had a page of instruction to help folks get started...
I never bothered to tighten the toe straps, though. There's little drag in most rollers, leading me to ride in a high gear. Even then, there wasn't much reason to tighten the straps, especially when learning.
Whenever I see someone weaving left and right and unable to ride a straight line, I often think "There's someone who should spend a winter on rollers". Rollers will definitely teach you to ride in a straight line.
Steve in Peoria