Hi Paul
The operation scared the hell out of me, but amazed me at how I came out of hospital the following day with little pain from the operation (mine was Da-Vinci robot RP via keyhole surgery). Mobility wasn't an issue other than having a wee bag strapped to my leg. Make sure though to keep the drain tap SHUT or it gets messy!
What irritated me was not being able to get comfortable in bed with the catheter/drain, a little bit of leakage from it, and the irritation of leaking badly when the catheter was removed 2 weeks later. Bliss having it removed, but it took time to re-learn controlling the flow.
Just give yourself plenty of time to recover.
Best of luck and sorry to hear the op had to be put back.
Andrew