18.5 months here, I was off for 14 months with the second.
The main thing that made a huge difference, was the morning. When they were tiny, we'd go down and I would make a cuppa, get milk for the toddler, then go back upstairs. When they were a bit older I'd nip down alone. Then, we stayed upstairs until I was washed, dressed and had put a bit of make up on (Not for everyone, but it helped me).
Then we'd start the day. I found it I didn't take this 15 minutes in the morning, often I'd end the day not even having washed my face. Once dc1 was 2, he went to pre school 2 mornings a week. We went to a swimming group once a week, without fail really. I would visit my parents, sometimes staying over for a bit of a break as 'D'H was useless (Not together any more)
A structured routine, especially at key times (first thing in the morning, bedtime etc) is key. You know what you're doing, they get to know what's happening when.
Get out of the house. When dc2 was a baby, I'd put him in the sling, and dc1 in the push along trike, and go for a walk.
A few months on, dc2 in the pushchair, dc1 on the buggy board. Go for a walk. (We are rural so no shops or anything to walk to, and I did avoid town with them, mostly)
Shopping - make it an outing, if you are not going to shop online. Trip to Tesco, mid morning, do the shopping, hand out the free fruit. Then hit the cafe for lunch.
My weeks were much the same, set things on set days. Those days were the same. It did make life easier.
I was pretty much on my own with it, as in no real support from their dad. And without him altogether after a few months, so one thing I will say, is get the time for yourself. Talk to your H, makes sure he does his part.