The only thing I'll add is to be sure to communicate the plan to the boat crew and DM's about how you want to handle on/off. They may be able to suggest best practices. I've seen a variety of situations - amputees 1 below the knee, 1 total arm. Neither did giant strides, rather sat on transom edge and slipped in. Couple young adults who were on the autism spectrum wanted to be last to enter the pool. Folks who've had various hip/back surgeries and wanted to kit up in the water and de-kit before getting back on boat.Clipped the kit on the tag line and hauled it aboard after the diver. Some friends who are well into their 80's dive with smaller tanks. Scuba is the great equalizer, just takes a plan. The nice things with boat diving is there will be a guide in the water who may be able to assist in the water. I like boat diving Bonaire, some days I just don't feel like loading the truck, dealing with the sand - roll me on a boat, kick me off, and I'll see you later. As others said, most Klein sites are benign and guides usually do a current check before starting off. There are a couple that are deep water moorings and require a swim across, but usually not frequented unless requested and the group can handle the swim. Other easy shore dives may be Tori's Reef - you can kit up in an outflow pool and float. Something Special is the north end of town, park on the street, sand beach entry. I would suggest evaluating her abilities after the surgery as both sites have sand and some rocks/coral rubble to contend with.