Rach,
I hope the kids weren't really doing what you said in your previous post!
To get back to the lemons (if anybody still cares), I found forward lemons impossible at first and would get stuck with my feet apart, unable to move them backwards or forwards, then one day I did something differently (still don't know what) and I could do them. I now do them cos I can, backward lemons aren't quite as good, but after having been stuck on the lemons for a long time I realised that you should be able to do most things eventually, although my time scale seems to be measured in months rather than weeks.