Not really. I think it's just practice and pushing yourself a little lower each time.
Fwiw here's my tactic: I do them with something under me for support. The goal is to go down to that level, with hands and free leg out in front, but not actually put weight on the support, then raise up. The whole idea is to keep me from smacking my bum into the floor if I fall. I started with a chair, that I mastered pretty easily, then I tried the kid's table, which was too high, and the matching chairs which were too low, so I moved to a bench which we have built into our bathroom, which is lower than an adult chair. I do the same thing in there, but haven't been able to move beyond it yet (kids chairs are next step). At a guess I'd say it's about 1.5ish feet high, or roughly what I remember a gym bench (for presses) being. When I was being good about it I was aiming for 10 on each leg a day either while I waited for the shower to heat up, or whenever I could. Hopefully once the proverbial seal is broken and I start doing them again, I'll go back to doing them daily. For the moment, I'm just too sore. Darn trainer. But I love him.
Unsurprisingly I can get lower/do more reps on my spinning leg than on my backspin leg.
Wall chairs are also goooooood for this. Our trainer has us do lots of those. I'm expecting them next week, if he holds true to form.