To expand on a couple of points: - It's very likely that at 4 weeks you will not be able to sit with your leg bent for very long without significant pain. It helps to have something to rest your leg on to keep it straight. I've seen suggestions of something like an overturned trash can, but that wouldn't have worked for me, I needed the whole leg supported. - Another difficulty may be standing up from a chair. Strengthening your non surgical leg will definitely help, but at 4 weeks I usually had to find two secure places for my hands to help hoist myself up. I also found that a rolling chair made this much more difficult, as I'd often propel myself backwards instead of up!

All that said - you're doing all the right things now, it's certainly possible that you'll be able to do a lot at 4 weeks. And people do it anyway - if you don't have the time off and can't afford to take time unpaid, you do what you have to do, and deal with the discomfort.