It will get easier, but exactly when depends on the child and their circumstances, and your preferences too.
With my DD, sleep was always an issue. But she started developing routines at about 5 months, and that made it more predictable. She also became better at napping in her pram at that age, which gabe me a bit of a break. But she didn’t link sleep cycles for naps until she was about 15 months old, and to start with she needed a lot of help for it e.g. feeding back to sleep or motion. Her naps were basically pretty disastrous for a long time! It was bliss when she was about 2 and was finally taking a 2 - 2.5 hour nap either in the pram or on the sofa. Loved it! Some kids are pretty crap nappers I’m afraid. Makes sense in my case - I’m useless at taking a nap, even if I’m exhausted, and I wake up feeling worse.
My DD is 4 now and I’d say I’m in the golden period.
Things get much easier when they start to communicate, so there’s less guesswork for what’s wrong. I don’t mean you have to wait for proper spoken language, when they can point or do simple gestures it really helps. I think this was about 9 months (but I can’t really remember).
Mobility makes things easier in some ways and harder in others. They are more content and able to entertain themselves, but can also get into more mischief. If you’re able to baby proof in advance I’d say it makes things much easier, but some say it’s harder because you can’t leave them on a playmat and expect them to stay there while you nip to the loo. It’s all about preparation - if you don’t overuse playpens/high chairs etc then they retain enough novelty value to be used when you need them!
I’m always amazed by those that say it doesn’t get easier, it just becomes differently hard. Seriously??? I currently have newborn twins and they totally dominate my life. There’s absolutely no way it can possibly stay this tough or nobody would ever survive having twins!