Please tell me- how do you change poopy swim diapers? Disposable? Reusable? I mean step by step like I'm five.

C has pooped in both our reusable swim diaper and a disposable. The disposable wasn't too bad, which was lucky since we were at a pool not that close to our place and I had to use a public bathroom. The reusable was at our pool right outside our vacation rental, which was lucky since I splashed poopy water all over the toilet taking it off!! I feel like there was be a smoother way...

On the plus side, no leaks either time, so I'm not complaining! But I'd like to get another reusable swim diaper for this summer if I can figure out an easier way.