i just learned unspins… like last week. so i learned by landing on the cranks, and just put your wieght back, and hold the seat from flying forward like you say it was.if you land on the cranks it helps keep the wheel from spinning a bit but now im have th trouble of getting myself to land on the pedals rather than the cranks so i can ride away from it easier. good luck with that!
Yea definatly a step over. I was sort of learning them and can land the acational one I always find the wheel trys to roll forward when standing on the crank, I have moments and find it hard standing on them.
The way I learnt them was from starting off as a mount. Step up onto the tyre with what would be your back foot then flick round and land on the pedals. When you get that start on the uni with your front foot on the crank, take your back foot around pushing the frame back a bit (with your arms), place your back foot on the tyre (like you were doing in the mount) and flick round land on the pedals and ride off.
The problem I have (like I wrote before) is that the wheel trys to roll forward. I think the key is to doing it fast so it doesnt have a chance to roll far but one thing I found that helped was to do it facing up a slight slope.
Hope this helps, I think its right and good advice but I can barly land them myself :o