Make sure you can equalize safely and rapidly. If you have trouble clearing your ears, practice equalizing on your way to the dive site to help open air passages. A streamlined profile in the water will help you navigate in currents. Too much dangling gear can act like sails, pushing you ahead of the group. Play the float.
Pinpoint buoyancy is important when diving Tobago.
You must be comfortable descending, ascending and performing safety stops without a mooring or anchor line to hold onto. You can ascend the drift marker line as a reference, but you can't use it to offset negative or positive buoyancy. Have an exit strategy. Follow your divemaster's instructions, though in most cases you'll hand your weight belt to the crew, then your BC and fins. If the boat doesn't have a ladder, keep your fins on.