Pad,
I had RP in August and so far due to complications, 2 lots of catheterisation (4 weeks with leg bag).
I cant stress enough the importance of rest. Im a marathon runner and it drove me nuts. I was out walking a couple of mile per day in the first week but i soon slowed up and took to a potter.
The problem is, the bladder is effectively empty and the catheter balloon end is bouncing round in the dry bladder. I was finding any more than say half hour on my feet and i was passing pure blood and felt ghastly. The chaffing around the urethra, particularly at the exit point on the penis wasnt pleasant either.
I agree with Tony, I found an extra strap on my thigh kept things nice and steady and so long as i was careful, it was easier.
Im back in surgery next tuesday for a diliatation and likely to have a further catheter. Ive told the surgeon it must be out by Friday as im running a 28mile fell race in the cotswolds at the weekend. Im just keeping everything crossed i can.
Good luck