I've taken the plunge.

[sarahp]

The pressure is now on to find a class to instruct at as up to now I have only taught one on one

I find classes easier cos there is usually more going on.  One trick I learned whilst teacing children and being observed - if you are ever stuck for someting to say - bye some time by asking the other people if they have any comments or did they see something that they thought was good from another class member.  If nothing else it gives you a valuable minute to think of something to say