Thanks once again for the replies, I do feel so much better now. I reckon I'll be back here in 8 weeks time wondering what I was ever worried about!!!
Can I ask one question, if I can't find a suitable nursing dress are wrap style dresses the easiest option?
Sarah xxx
Wrap style would be easy to get the boob out... but you'd have to get it out over the top of the dress so you'd have the whole thing on show and would need to cover with a shawl or something. Easier option if not getting a purpose build nursing dress would be to go for a top and skirt/trousers. That way you can have a similar colour vest underneath and lift the top and pull down the vest, leaving nothing at all on show when baby is attached.
I'd suggest lots of visits to Starbucks or your local BFing support group to get your confidence up before the big day as well.