I'm late to your party, mick, but you've gotten a lot of very good advice. I haven't had time to peruse the entire 3-page thread, so I may repeat some things.
Whatever you do, don't think you have to "do it all yourself." Your medical team will be there to take you through those first few days, one little step at a time. Don't worry too much about what comes next. Just take the advice of babies and dogs, and just "live in the now." The team will make sure you don't miss out on anything important medically, and the rest of life will be there for you when you are ready for it.
As
pellicle mentioned, do what you have to do to "keep things moving" inside. Those surgical meds and pain meds can bring your intestinal system to a complete standstill, and I can tell you from experience that you do not want that. While you are in hospital they will control what you eat and your meds, but once you are discharged home, you should receive advice about bowel health. If no instructions are given,
pellicle swears by kimchi (Korean fermented cabbage), while I chose the more conventional Miralax laxative recommended by my docs. Whatever you do, do not let constipation set in. I did, and at 4 weeks post op, I was re-admitted to the hospital to get it sorted out. Not fun. They sent me home with Miralax, which was gentle (no stimulants) but did the trick.
One thing to look forward to is the possibility of cardiac rehab once your surgeon feels you are ready. Prior to my surgery I was a 5-day/week gym rat and jogger. After surgery I was as weak as a kitten, and due to some complications, had a slow time of it. I started rehab at 12 weeks post-op, and by the time I finished the 12-week program I was back to my full routine at the gym (except for the push-ups, for obvious reasons).
I've got horror stories. You don't need them. What you do need to know is that in spite of all of my complications I am now 6 1/2 years post op and still doing more than I was able to do before surgery -- which has got to be some sort of an accomplishment since I am now going to hit 70 within weeks. Just listen to your body. You will soon be back here telling us all about it and helping others to make it to The Other Side of the Mountain.