We chartered a cat (from BVI Yacht Charters) for the first time this past February. We hired a captain for the first day, and I was glad. Captain Earl was excellent! He led us through anchoring (including attaching the bridle), mooring, etc.
I found maneuvering with the two throttles to be pretty intuitive. We had to change slips at Peter Island Sprat Bay, because in the first slip the electrical outlet was dead. I had no problem pulling forward and repositioning, then backing into the second slip.
When using the two throttles, it's often recommended that you lock the wheel. But when you're backing up, the water exerts a large force on the rudder trying to push it to the side. We found that we couldn't lock the wheel tightly enough to prevent that, and eventually the rudder would go slamming over. So we just left the wheel unlocked, so the rudder would (gently) go where it wanted to.
MrEZgoin mentioned being micro-managed on the throttle control. This generally happened after we were already attached to the dock, and the dock crew then wanted to optimize the tension in the lines. So they'd call out "forward on starboard", etc.
As we were docking at Scrub Island, the guy on the dock pulled tight on a line when he shouldn't have, spun us around, and whacked our bow into the dock. There was a scary crunching noise, but I guess that was from the vertical boards (made of composite) attached to the dock. Fortunately there was no visible damage to the boat. Also fortunately, my buddy was driving at the time, not me.

It was a great trip, and I would certainly "go cat" again.
Dan
