Foxtail - You'll be fine. Sense of humor really helps. And remember, given your size - the beds have extenders (not sure that extend THAT much) but the footboards do extend!
Superman:
Even with the softeners, etc, I think "being backed up" is a thing. And not just b/c of the pain meds, but something called ileus, which occurs when the bowels have trouble waking up after surgery. Let's just say my night 3 was a night I will not soon forget. I was out of bed every 5 minutes, on my own, and I really thanked the nurse who didn't pass judgement at 2 a.m. when, let's just say, the floor of the room, or my bed, was really not a pretty sight. To make sure my bowels weren't blocked they added my abdomen to the post-op CT scan. Turns out my bowels were not blocked and a special diet for a day or two cured what was ailing them. But they found an infection in my prostate - possibly the result of the catheter. They (in Cleveland) had not seen this type of complication before. It led to some hand-wringing, a bunch of consulting with a bunch of different doctors, and a near-brush with prostate surgery. But my incredible surgeon's cooler (and smarter) head prevailed and I went on six weeks of Cirpo and an intravenous antibiotic (via a Pic line) as a precaution to spare any infection getting to the new valve. The infection went away. In the end, it was all really just an annoying distraction.
Paleo woman - that's great on the street clothes. Makes Total sense. I wonder if that's a UK thing. And this tip on the bed: Remember, they are (or in Cleveland were) filled with air. My biggest complaint, with the post-surgical back pain, was that the bed sagged. Finally, one nurse added air to the part of the mattress that sagged. Solved the problem. Foxtail - don't hesitate being a squeaky wheel on that if you're in a hospital with a saggy air-filled bed. Also, for the ICU - bring some noise-cancelling earphones or earplugs and an eye mask to drown out the light.