I haven't done any of those things because no one suggested that I do, but I was on a liquid diet for 2 weeks before the surgery and 2 weeks afterwards. So after a month of not eating, I had to chew slowly and do the other stuff. And I almost never drank while am eating even before so I had no trouble with that.
One thing that I knew AFTER my surgery that I wished I knew before, was exercise. If you could try to start some fitness program (even if just walking) you could improve your lung capacity and make your post-op recovery smoother. If you can do it, I highly suggest you do.
Good luck sweety