You could stay in your job as it's so close?
A perfect way to see if you'd like it! You could easily move aboard for a month or better to get the feel of it. Only use the house for laundry, etc.
Myself? Had I no responsibilites to anyone other than myself, and in your shoes? No question, sell the house, buy a bit bigger, better equipped boat and chase the dream. We only live once.
Best of luck however you decide.