The chest tube incisions will pucker right up and almost disappear, the scars from those will be tiny in a short while.

As far as sleeping goes, I heartily recommend a foam wedge to keep you partially sitting up. It is really hard to roll over to your side when laying on one of them and it won't take long to get used to sleeping that way. It hurts a whole pile less to lie on your back than your side after a thymecotmy

Best of luck with your recovery, hope it goes well and gives you everything you hope for as far as remission goes.