If it helps any, here's what I did with my husband. Position the leg pieces high on the thigh, a little below his butt. Lift via the hoyer and pull the pants down as much as possible while he's suspended in the air. Move to the toilet/PWC, then sit him down. Detach the sling, then lift a leg at a time to get pants down/off if needed. It takes some patience and practice, but becomes so much easier than any other sling we tried. (None of the OTs we worked with had any idea that a sling like this even existed. For the most part, the OTs were no help at all with toileting. Thank God for this forum!) My husband was tall, so we also had to get a hoyer with a higher lift height than most. Luckily, our local ALS Loan closet had a power one that fit the bill.
Good luck - you can do this! 💕
P.S. - We only used the toilet when he needed a bowel movement. Otherwise a urinal (I liked one called a Uri-bag) was the way to go.