Hi Bev, welcome to the forum.
I can understand you being a little apprehensive but don't let that put you off. The trips I've done have been very well organised and really enjoyable.
You will probably have loads of questions and this is understandable too. The forum is the place to ask them and I'm sure one of the members will be able to help. Try not to get too stressed though, after all it is a holiday we are talking about :)
Julian