If you're making your own water, maybe you could have your husband fill a 33-gallon trash can for you and condition it or use ro
water and add your salt, whatever you do, then have an empty can sitting near the tank. You only need to change about 17 gallons (20%). I'd keep the lids so that you can cover them to keep them clean so you can make your water change at your leisure. If you're changing water, say once a month, you could just siphon out your water into the empty can and maybe use a pump with tubing to put the new water into the tank from the new water can. Then your husband, who I'm sure is wonderful and understanding, can dispose of the old water for you. You could also cut the top of a one-gallon water jug and just dip the new water from the can into the tank, one slow scoop at a time.... can you tell I have a bad back? I'm not sure how much a gallon of water weighs, but you could move as little water as need be at a time so as to not lift too much.
If you're picking up water from the lfs
, just have hubby pick it up for you and put near the tank, maybe dump it all into a trash can so you can dip it a little at a time.
This is basically what I do, I have trash cans with wheels, so I can just wheel them back out to where I keep them. I marked the outside of my cans so that I know how much to fill it up without guessing.