If you want to live on a boat because you want to live on a boat, you'll overcome any issues and enjoy yourself (I certainly have and do).
If you want to live on a boat for any other reason, you will be miserable.
I have a pet lizard (bought for me when I was a child and it refuses to pass from this mortal coil).
Just me, although two of us lived on here for a while.
Miss nothing really from living in bricks and mortar.
One piece of advice? Find someone who really knows what they're talking about and ask their advice on how things work.