So that day we did one stair. Then one stair,pivot and descend. I was going to do two stairs, descend and call it quits for the day, but I ended up doing three. The next day I went up all eight.
I have to say I crowed, "I'm on the top of the stairs!", which got some amusement from the others in the gym.
Yesterday we tried one full-size stair. And today I did all four, turned around and came down. Yay! First achievement unlocked: In theory I can now get into my house. And out.
Still a lot more to do. But I've managed to push the envelope further every day for over a month. Well, technically every day I have therapy, which is usually six days a week.