Just do it.
I sound like a jerk but you just have to. There's really no progression you can take for a webster, when I was learning mine I was practicing whipping my leg behind me and seeing how hard I could do it and all of a sudden I realized I had kicked too hard and I was in midair. Then in midair I was like..."shit, I'm halfway through the flip, might as well finish it...TUCK LIKE A MOFO" and then I landed on my butt haha. Then I realized it didn't hurt and tried again. Then I stopped because I realized I wasn't getting anywhere close and I haven't gotten back to it yet, but that's not the point haha.
So take that sand of yours and try it haha, I did it on grass, you won't kill yourself, trust me
