@15gb2 Haha I love it! Ours used to get sooooo mad when we went to put her down (still does sometimes!), and she learned to scowl very early on; that face always told us that she KNEW that once we'd conned her into falling asleep the best party in the world was going to start.
The sleep training was a tangle. My husband wanted to, and so did I, in theory, but confronted with the reality I just noped out every time. Our paediatrician---very no-nonsense, no pleasantries, loved our daughter but was vaguely annoyed by us---told me that rocking or nursing her to sleep was a little like playing a trick on her, because she fell asleep in one place with me, and woke in another place, alone. He said that her learning that her bed (well, crib) is a safe, restful place while she was awake would give her lifelong self-soothing tools. God only knows if that's true or not, but it was enough to get me to try.
So I started with baby steps. I started dream-feeding her instead of nursing or giving that last bottle while she was still awake, and then I got her to sleep in the rocking chair but didn't rock it, and on and on until I was putting her in her crib awake and rubbing her belly until she fell asleep, and then sitting in the rocking chair, nearby but not touching or engaging (other than 'it's OK, sleepy girl' every now and then), and ultimately she had a bedtime and was fine with going down after her story, and just staring out the window or playing with her hands until she dropped off.
It wasn't a linear process, and we did have to listen to a few bouts of crying (I could never handle it and counted up to one minute before going to pick her up, and my husband would yell 'Nooooooo! We were SO CLOSE!'), but my husband was fully present for all of it and also kept cracking the whip when I wanted to wimp out (I never felt closer to her, early on, than when she was drifting off on my chest, getting heavier and heavier, and apart from anything else I didn't want to give that up!). The whole thing took about a month from start to finish.
She did have a serious regression when she was two after she'd had a cold and lying down was just tormenting her, and for a while I was rocking her back to sleep. When she (I) was ready, I did an abbreviated version of the initial training (frankly it is a LOT harder when they start to be able to reason with you, AND they can just get out of bed). These days, about once a month we'll wake up in the morning to find her nestled between us (how she monkeys up, climbs over us, and shimmies under the covers without waking us up I will NEVER know), but apart from a little pissing and moaning when I tell her it's bedtime, it's clear sailing.
I'm sure this is a LOT more than you were asking for! Really the worst part of the training was just deciding to do it and then starting---the thought of it made me miserable more than actually getting on with it. Every kid is different, and sleep training can go any kind of way, for sure. But you know your kid! There's a big difference between 'This is new and weird, and I don't like it cos it's new and weird' and 'This is NOT WORKING for me, Ma; cut it out'. Listen to your gut! Beyond needing our love and care, there are zero absolutes with babies.