I'd agree with Irulan. i know you can change the tension on Look cleat to tighter and looses and when I started off with mine I had them on the loosest setting possible.

I then set my bike up on the home trainer and practised a bit till I got the hang of it, so i didn't have to look down too much when I was clipping in.

Also, it took me a few goes to realise I should be flicking my foot out rather than pulling or wrenching it. ( I must admit I came a cropper at a set of traffic lights on a quiet rode when I panicked and forgot to flick/twist)

With a bit of practise I'm sure you'll be fine, however if it's a different system you're looking for I can't recommend Speedplay enough. I had a problem with my knee so I switched to Speedplay as they have lots of float. The entry/ exit is VERY easy , but on the down side they do cost a lot more than Looks. if you really find you're not getting on with Look you maybe you could consider switching, but give it some time and i'm sure you'll be fine.