Thanks guys, these are the sort of things I need to try and practise. I will put those suggestions into effect (just tried the standing on one leg bit at my desk). I did find spinning more difficult at first - lost my balance after every catapult the first week I tried it, can usually manage it now with no probs - but I did practice spinning at home.
I have watched others with good control (eg salsa teacher last night) but don't know how they achieve it. They were able to stop at any point in the move so I will try that as well.
I know its about balance rather than weight (I'm only about 7 1/2 stone) and I know it will be better for guys I dance with if I can control my own momentum and weight rather than them having to 'catch' me (not that I fall over, I'm not that bad! I just want to improve.)
Ta,
Lynn