I've gotten tons of people up. You try to get them to do it first on their own by getting them on their knees and giving them a chair. They face the chair seat, and put the upper part of the body over on it and use their arms to push/pull. If they can get one knee up then it is much easier. For a full lift, it is a killer for one person, but if they don't weigh too much you can do it. Under the arms, don't let them grab around your neck and pull you down. I always say they aren't going to hurt themselves on the floor, they can stay there a bit till you figure out what to do. (as long as there are no injuries) No reason to hurry, calm down, the fall is over.
I always said once an older person starts falling a lot the deterioration seems to become increasingly more so.