Okay, first of all, there aren't any trainers or hex editors for Curse of Monkey Island, because Guybrush has no stats, skills, hit points, or anything else you could
conceivably want to edit. I'm really surprised how many people ask for things like that.
The only way to really cheat in this game is to look up the
solution to a puzzle rather than figuring it out yourself. If you want to do that, or you just want to learn more about this game, here are a few good
links for you:
Universal Hints System
is a great place to get a spoiler for one specific puzzle you're stuck on without accidentally ruining any of the rest of the game--they have
their walkthrough uniquely structured to reveal only one hint at a time.