You set the charge by twisting the wiimote. Then, when it is finished twisting, flick your wiimote and it should set the charge. Then run off the boat and it should blow up
I think they might be referring to how hard it is to get off the boat without getting killed? It took me a few tries but I did it. I played the game first on medium and it was pretty difficult but was a good challenge.
Keep trying and you will get it done. It is a game after all. If you were able to breeze thru without dying or being challenged that wouldn't be any fun now would it?