I am 78 and it's been two months since my surgery. Here are a few tips to add to the many other excellent ones above.

My stomach area was quite painful and I was glad to have been forewarned not to wear a belt.
I wore knee length sports shorts which were several waist sizes over my normal size and held up with el-cheapo suspenders that clipped onto the top of the shorts.

I used the big catheter bag which I placed in a small plastic bucket. For showering, I jiggered a bungie cord to hang from the shower door to a fastener in the bag. For drying off, I hung it from a towel rack. I never used the smaller bag until the return to the clinic for cath removal and it worked fine.

For the trip to get the catheter removed, I wore a longer version of the loose athletic pants with the suspenders.

My surgeon recommended walking 15 minutes every hour for recovery. I found a cube-shaped countdown timer on Amazon with 15, 30, 45 and 60 minute intervals. I would flip it to 15 minutes to start my walking around the house and then when I would sit down again I would flip it to 45 minutes. I continued to use this for several weeks after cath removal until I returned to my regular walking routine.

Here is the title of the cube ($11.99) if you want to find it at Amazon:
Feilifan Cube Timer, Time, Kitchen Timer Kids Timer for ADHD Productivity Workout Flip Timer Classroom for StudyTime Countdown Management Settings 15 20 30 60 Minutes-White

I phased in regular foods slowly with a mostly liquid or soft diet to avoid any straining due to constipation. I also needed Miralax to soften my stool again after several weeks when I suddenly encountered constipation. My primary care doctor advised me to take the Miralax twice a day and that worked.

I also found a seat cushion at Walmart with a removable cutout for the perineal zone. This was valuable when sitting at the kitchen table or on wooden deck furniture. Equate Memory Foam Coccyx Cushion, Black
https://www.walmart.com/ip/Equate-Memory-Foam-Coccyx-Cushion-Black/228156630?athbdg=L1102&from=/search
For footwear, I bought a cheap pair of slip-on shoes at Big-5, so I wouldn't have to bend down to tie my shoes.

Also regarding pain killers, I used only Tylenol at home, the doctor's instructions said no ibuprofen, I think because it can increase risk of internal bleeding.

Best wishes for your successful surgery and speedy recovery. You can do this!