I agree with the previous suggestions. Please remember you are chartering to have a fun time. This means decreasing the level of your stress, not proving how all knowing and powerful a sailor you are.
I would urge you to take a skipper for the first day. It will just be a lot easier getting out of a strange harbor with an experienced hand on board. That has nothing to do with ability to handle the boat. You will also find the skippers in the BVI are extremely knowledgable about the area. With several hours to discuss the area most skippers will tell you of their favorite places, which you would be unlikely to find in the guidebooks and usual skppers briefing. Additionally getting on a strange boat and learning where all the valves, switches, etc are is a lot for a relatively inexperienced sailor to absorb in the dockside "walk through". Having several hours to explore the boat with a skipper aboard makes learning the boat a lot easier.
Practice picking up a mooing as suggested above. If that does not go well the first day, there are lots of harbors in the BVI where you can drop an anchor
instead of picking up a mooring. At the end of the charter when it is time to go into the marina, get on the radio
, and ask them to send a boat boy out to help you come into the marina. Handling the boat will be the least of your worries. You will have to worry about which slip, which side to put the fenders
on, where to put the mooring lines
, what did that lady on the marina radio
actually mean when she was talking to us, what did they mean by stop at the gas dock, and where is that anyway, etc. Let one of the boat boys deal with all of that. You concentrate upon having a relaxed finish to a great charter.