I was in the same situation - 2 DC already, 1 just starting school when DTs were born and the other in nursery about a mile from the house 3 mornings a week. Closest family 5 hours drive away.
I had a family member came to stay when DTs were born and she stayed Mon-Fri for the first 4 weeks (DTs were born on a Mon morning) and went home on the weekends. DTs were emcs at 35wks. I was in hospital for 5 days and then home. DTs stayed in for another 2 weeks. I was cleared to drive after 3.5 weeks and honestly, I felt totally fine. Horrible as it was, having the DTs in the NNU actually helped me recover because I was at home, sleeping in my own bed at night, and not having to care for newborns.
Once family member left at the end of week 4 (2 days after I was cleared to drive) we were on our own.
We had very little genuine community around us at that time so while we had a couple of friends who made meals for us in the early days, it was very little. No help with school runs or nursery runs. DH worked about half an hour away and left early in the morning (usually around 6.15) but got home most evenings by about 5.30pm-ish.
We had no other help at all. It didn’t really occur to me, and to be honest, we couldn’t really have afforded it.
We were pretty regimented with naps and feeds and routine. It was the only way to survive.
Not saying this to boast - looking back, those first two years are a bit of a blur - but just to say that it IS doable, and while they are a blur now, it genuinely never felt that bad at the time.