Not wanting to derail another thread.
I had a 22mth gap between my two older kids. I didn't find it that hard other than dd2 needing hospitalisation for 2wks in PICU for bronchiolitis. Dh went back to his normal shift work when dd2 was two weeks old.
What worked for me.
Every morning I went for a walk with both kids. Packed the pram with snacks/sometimes breakfast/lunch. We walked to a park/shops/playgroup/library. Dd1 would play, I'd boob dd2 or she would sleep in pram. We would eat our packed food. Head home for naps in my bed. Then whilst dd1 would potter outside in the yard I'd prep dinner for the NEXT day to put in slow cooker overnight. Clean kitchen/tidy up/bring in washing
Bedtime - I'd bath both kids together. Dress and feed newbie in bathroom whilst minding older child. Then dry/dress toddler. Read both children books whilst feeding baby. Sit with toddler to put to sleep whilst cluster feeding newbie.
Once both asleep or once toddler asleep (baby in carrier) - pack food for next day, do other jobs. Then go to bed.
Repeat next day.