Uncorked,
I am so proud of you. I am sure you have thought this all through, but if it were me, which I recognise its not, I would be worried about the 18 year olds in a way that would distract from my recovery.
As you will not be there, is there any way Dad, Step dad or any grown-up could move in to keep an eye so you can keep your head fully in the game?
Either way, be kind to yourself, you can do this.