First, I'd like to commend you for looking out for your friend and being supportive!

There are a lot of different ftm surgeries. There isn't just "the one". While I haven't had any yet, it is something that will happen down the road for me. While there's almost always going to be doubts, it's really important that your friend doesn't do something that will ultimately be regretted later - especially something so permanent. They need to take some time - or a lot of time - to do their own research and come to their own conclusions. I'd also recommend trying to find an LGBT counselor for them to talk to if that is at all possible.

Whether or not it is morally acceptable is very personal. Are they concerned for religious reasons? General internal values? Something else? Whatever it is, there's bound to be arguments on both sides. And it isn't always about who's "right" or "wrong". Ultimately, a person needs to find what's right for them, and if that's surgery or not... it'll be different for everyone. It's not a simple or easy process. That's why I was recommending a counselor.

As for recovery and such, the surgeon will be able to help with that as well as going over the risks and possible complications. They'll also be able to give suggestions to prepare for the surgery and for after-care. If your friend smokes, they'll most likely be told (not asked) to quit for some time before and after the procedure. Eating right and being physically active as possible are generally good things to prepare.