I came across a page explaining how to do sim cutting the other day, funnily enough. I'm not averse to having a go, especially as it seems to be a lot easier to get a free regular sim than it is to get a free micro sim.
The problem is, I'm so new to all this I don't even know whether to assume that any regular sim from any network will automatically use 3g if put into a 3g device. Until 2 weeks ago I'd never owned a 3g device. I feel so out of touch ...