spotty re supply - in the last few days, since I've been hand-expressing more to compensate for the extra bottles, I've noticed my breasts are getting FAR more engorged between expressions. So for 6 weeks poor little Z has obviously not been feeding from them effectively, but even at this stage it seems that I've been able to increase supply by increasing demand. So I'm sure you will be fine.
Finding time to express IS hard though, I agree - it's been pretty punishing for me to bottle feed and wind Z and then to express as well, especially at night. I find it easier to do it by hand than with the pump - I have a bottle next to me and squeeze into it when I have a minute, and then after 5-6 hours have passed I add the contents of that bottle to what's in the fridge. I have a medela swing pump but tbh I think I get more by hand - I use it just to give my hand a rest now, pretty much. Plus rigging up the pump is such a performance and needs time set aside, unlike just giving myself a quick squeeze!