Answering from both angels. I was a single mom and now I am married with kids.
The only thing that has kept me sane is by taking it on right at that moment.
If your baby has a holding position that calms him/her then use that to your advantage.
I try to do things immediately or else forget it.
When cooking I clean as I go leaving very few dishes after dinner.
When I wake up, I make the be immediately.
When feeding the baby that is time for both of you to enjoy each other and rest.
When showering have clothes out prior to taking one.
Prepare all clothes, meals, etc the night before.
Have things handy!
If necessary, keep a to do list available.
Most of all NEVER PANIC. Frustration is not good for neither you nor the baby.
If you are anything like I was when my child was young, please do not hand onto unnecessary items. The way to determine if it's necessary if by seeing how long ago you used it and how soon will you need it. If it's six mos or longer unless a treasured item (treasured not wanted) then toss it.
It's hard but if you're anything like me, you will have something to replace it very soon.