The only big difference between a 20' boat and a 40' boat is docking. Practice as much as possible when you get the boat, maybe with another captain aboard. For awhile, plan your dockings to avoid high winds and currents. Slow speeds and low throttle positions should keep you out of trouble. If a docking starts to go bad, don't be afraid to stop, back out and try again. In my current boat, I dock at idle, taking my speed off long before the dock. The only time I go above idle is rotating with twin screws.
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