I would say that you shouldn't need a nurse. You'll be laid up recovery for a minimum of 5 days, more like the full ten days that the catheter is in you. You'll walk around your house, etc., but you won't be going to work or driving (based on my experience). I had the single incision DaVinci robotic assisted method RP, and I felt assaulted and pummeled below my navel. I had no "ability" (forget "desire") to move around too much.
I found the smaller leg-strapped bag unnecessary and annoying. If you are forced to go out in public, perhaps an early return to work, then yes, you'll need that bag. It was annoying because I had to remember to check it/empty it every one to two hours (they fill fast). And...you feel the weight of it increasing as it fills hanging off your leg.
I was fortunate in that I am retired, so I just laid and walked around my house with the larger bag. The larger bag should have a plastic "hanger" hook device. I hung it off the side of my bed at night on my bed frame. I am not an active sleeper, so I never felt a tug or had issues. The inflated balloon inside your bladder will prevent the catheter from falling out or being pulled out. In terms of emptying the catheter, or changing back and forth between the smaller one, you just need to have an organized bathroom counter top: I'd have two alcohol prep packs already open and laying on top of the pouch they came in. I'd have the catheter to be swapped for, out and ready. I would stand over the toilet and open the stop-cock with the one I had connected, let it drain to empty, and then shut the stock-cock. Then I'd walk to my bathroom counter, pull the tip connector out to remove the now-empty catheter, and then use the readied alcohol prep pack pad to swab and connect the other one. Once I decided to use only the larger catheter bag, I still cleaned the tip once daily. And...
One extra bit of advice: When the nurse assistant pulled and removed my catheter after 11 days (a momentary big ouch), she wanted to leave the VERY STICKY ~3" x 4" adhesive pad that secured the catheter tubing from my penis to my thigh. She said that they "find that the patient does a better job removing it at their pace than they can." I learned why when I went home. The adhesive on that pad is like epoxy or Gorilla glue. I gently, slowly started to peel that adhesive pad off my inner left thigh. It was a struggle. It was very painful, and it took a lot of skin with it. I now have a permanent, very visible red scar about 1" x 1/2" in one area where it just would not peel off. I had to more assertively pull, and it took a lot of skin with it. Good luck.