Hello Flowerpot,
I see you have had a lot of good advice already, but can I add a few things to them.
I have been using a hoist for the last 4 years for my husband and also my late mother who are/were both stroke survivors. The hoist itself is easily managed once you know how to. One person can do it at a push but I would recommend you always have two people operating it to ensure you have your eyes everywhere.
A good positioning in the sling is essential to get a good landing as is pushing back and down on the kneeswhen going in to a chair/wheelchair.
Ensure the sling is supporting the head fully I always put my arm around my husbands neck as well.
I would recommend you practice on each other, go in the sling yourself and try how daunting it is, that way you will appreciate what your cared for feels like just much worse as they are frightened and cannot hold their weight themselves.
Make it routine to put the battery on charge after each use, that way you will not come unstuck.
Please PM me if you have any further queries I would be pleased to help.
Well done for caring at home for two people, it can be done with a good routine, I did it for years, but please make sure you have good community support.
Wishing you all the very best.
P.S. Have you got electric beds and airmattresses, which are almost essential for use when hoisting?