Thanks to all for your suggestions / links to previous threads similar.
All very useful.
The one thing I am certainly going to do is have a clearout of my kit bag the night before, as I am fully aware that I actually carry things such as nocks that dont fit my arrows, a full set of allen keys both metric and imperial etc etc - a clearout should make emergency repairs/adjustments (just in case) quicker than spending 10mins trying to find the allen key I need!!
Thanks again everyone!
(sure its not usual to be THIS nervous before a comp!!
)