Right on, Queerpunk. Glad to see an "old timer" back posting!

As QP said...get off the internet and go out an try it. Technique is most important and next is leg strength. If the gearing is too high or you are going too fast, you might not be able to skip/skid while sitting.

Have this conversation with your legs when out riding:
"Okay, Mr./Mrs. Leg, the next time that crank arm comes around, I'm not letting you go past 9 o'clock." If you are forceful or seductive enough, your leg will just have to listen to you

Just ride more and try more. After a few weeks of work you should be able to take speed off while in the saddle and with either leg. Backpedaling is best as you stay in the most control of the bike and you save your tires.