i'm short on time too... will be back in Miami sunday night but preparing to head to the Exumas within 10 days. Where is the boat?
if you are confortable with the single engine, you'll be fine with the twins, it's easier. one way to remember how to use the engine/tranny controls, is like shopping cart. visualize that when you pull on the bar (in this case the gear control), the cart/boat goes one way...