A.
I feel for you. For us, this was not an easy transition. For others, it may be, and I hope that's the case for you! We transitioned my daughter to a toddler bed at 25 months, after she climbed out of her crib about 3 times in 5 minutes. The first night was pretty much fine. And then it got much worse. I literally spent 4 hours getting her to sleep the second night.
What finally worked for us was putting her in bed after our normal night routine, then sitting just outside of her door, within sight, until she was asleep. I've gotten a LOT of reading done in the past few months! And truthfully, I kind of like having that reading time. I've moved further and further out of her sight, so that now, I'm actually in the next room and she can't see me. If she gets out of bed, I tell her to get back in bed. She usually asks me to rub her back, so I do that the FIRST time she gets out of bed, and the first time only. After that, I threaten that if she gets out bed, I'll close the door (she hates having the door closed). If she gets out of bed again, I follow through. Follow-through is so important, because at this age, they understand that manipulation works! That's why it's necessary to not keep singing, rubbing backs, etc. when they ask, because that could go on all night, and will teach a toddler that they can get their way if they pressure you. So, if she gets out of bed a second time, I close her door for about 15 seconds, then open it and tell her that I warned her she needed to stay in bed, she got out of bed, and I had to close the door. After that, she typically stays in bed and goes to sleep. It may take her 30 minutes to actually go to sleep, but she'll stay in bed and rest.