I don't recall if we have any Physical Therapists in the group, however if we do - please comment: One of the best things you can do for both your parent & yourself is to go to a PT appointment & ask the PT to show you the various methods of patient transfer, assisting in getting up from a wheelchair 9lock wheels, swing footrests away or fully remove, get wheelchair closer to the transfer point) or regular chair, moving up higher in the bed / roll to side & partially remove sheets / roll 189 back & then remove the sheet - repeat to install a new sheet, how to get someone off the floor when they are mostly cognizant but not able to assist much, how to transition into & out of vehicles that are different heights / door swing capabilities, etc.
Back in the early 90's, I was a Physical Therapy Aide in hospital setting & was instructed on all of these things because I was the person going to a patient room & bringing them down for whatever their PT needs were & then taking the patient back to their room.
These lessons have served me well both to assist the individual in need AND to save my back / neck, etc. Back around 8 years ago, I was able to assist a nearly 300 lb. person who had tripped. Just me. Scooped them up like I was a bantamweight bodybuilder.
Focus on your body position, their body position, foot position for both of you, arm locations (where on their shoulder or neck or under arm you place yours), how to instruct them, a countdown on what you're going to do & how you intend to do things so they know what to expect, etc.
There is far too much to explain in a Shag² post & I'm certain there are YouTube vids available however nothing beats physical 1:1 instruction. This ain't a tutorial on how to change oil or thread a needle.
Last night I assisted the RN @ Mom's rehab facility to get her moved higher up in the bed (one on each side) & about an hour earlier I transitioned her from the chair into her bed - easy peasy with experience.