Congrats! I found that as my child aged, the hardest point was when the cycle time allowed for three hours of sleep for the parents[1]. When it was only two hours, it seemed bad, but was way more restful than three hours. Once it got to four hours, it was much better. If possible, lean on external help during the three hour sleep cycle (grand parents, etc).
[1] we needed both parents for feeding logistics, although often it's not required.
Yeah, I feel like the past couple weeks have been the hardest so far, even though she's moved from sleeping 2 hours at a time to sleeping 3-4 hours for her nighttime sleep. Mind you, this is partly due to feeding/changing logistics -- she's less cooperative now that she has learned to crawl.
Leaning on external help is unfortunately not a great option for us.
It depends on the child. My first slept about 4 hours a night until he was about 2 or so. Getting him to sleep could be a multi-hour ordeal.
My second dropped off the second he was set down. We could pick him up and he'd wake up and be happy to be passed around - then he'd drop right off when we set him down again. The rest of my sons were more typical.
Personally I never slept well until they were post SIDS age.
[1] we needed both parents for feeding logistics, although often it's not required.