That should be your last option.
Don, as always, is right.
Look, maeh, think about it this way: Let's say you were redoing your kitchen. Would you go to a contractor and just say, "Redo my kitchen." And then wait til he finished? I doubt it. I think your wife would like to know what kind of cabinets: closed, open, glass front, material. I think you'd both be interested in the appliances: energy star ratings, colors, manufacturers, type of fridge - freezer below or above, side by side doors, ice maker...
You HAVE to know what you want, more-so in boating even than kitchen remodels.
We're not pulling your leg, we're simply asking you to do the homework and research necessary to avoid being disappointed, and eventually saying, "Oh, if I'd only known..."
Besides, learning can be fun!
And if you already know what you want and why (and didn't clearly say so), we apologize. If all you need to learn is how to install it, you can learn that, too. In fact, it'd be safer if you did, unless you admit to complete lack of faith in your ability to deal with AC current, which could be a good thing.
But you could still learn that, too.
Good luck.