I think a chin-up by September is a reasonable goal. I would use the stool to help for a while then just try jumping up and lowering yourself. At first you may not be able to lower yourself very slowly but if you keep it up you'll get there! I'm really a weakling and I'm pretty sure I'll be able to do it. The nice thing about jumping up for a chin-up is that you can do it whenever you want, no need to drag a stool over, for me that was another reason not to practice.
Life is death. We all take turns. It's sacred to eat during our turn and be eaten when our turn is over. RichMahogany.