I want to see how different hairstyles might look on me - is there a website I can put my pic on to do this?

[puff]

Just that really, am thinking about going short and don't want to get it horribly wrong!

don't know how good it is with your own picture but: makeover-o-matic

Try this one:
beauty.ivillage.com/stc/hairstylist/hairstylist.html?o=dcm,vhs,el,bty,mom

Great! Will have a play around on this tonight!