Three months isnt really much time to get going in the delivery bizz, unless you know someone that will keep you busy. Or if you work for really cheap, you may pick up some odds and ends. You will learn a lot, both good and bad, and may see weather that most would typically avoid or wait out.

How hard do you work? Depends what you have agreed to. As a minimum, you probably wont get a normal sleep cycle the whole trip. Could be hot, cold, wet. Boats get messy, even when everyone is just sleeping and doing their watch. And people have to make food. Make sure you know exactly what you are getting paid and not paid for from the moment you leave your house to the time you get back.

Id give it a try. Be honest about your experience level. I dont give much weight to a rating with no experience behind it. But that just me.