I have lifelong arthritis in my lower spine as well as systemic lymph failure (I'd make a terrible betta!), which not only makes it hard to get around but even to pick things up when my hands swell sometimes. It's really painful and the impact on my immune system means I am sometimes rushed off to hospital at the drop of a hat - infections tear through me like nobody's business. The last one, my temp hit 41 in the ambulance..
Anyway. I was pretty worried about fish keeping. Lifting tanks for cleaning, water changes, getting about for supplies.. But so far, things are good. Only one of my tanks needs 3 x weekly cleaning (for my weedy lil fish and his 1.5 g) and Daughter could handle that if I had to go to hospital again. The others could last a week or so without a change no worries.
It's taught me not to be afraid to try new things, within the limits I am given.