You need the right nursery I.e. one with more than the bare level of staff to allow for cover for sick days, holidays, planning time, lunch breaks (do these nurseries exist??? I've no idea).
In my experience here are some things you can look forward to/reasons I would never do it again...
Loads of activity planning, individual learning journal writing, room planning, report writing, parents evenings, daily activity journals and no time out of the room to do it during the day, 40 hours weeks plus. Not being allowed sick days unless you're actually dead - you will catch every bug going around but if you're not in, they will be "outside of numbers" especially in younger age groups. Difficult colleagues and managers. Open days on weekends that you're not paid for that you have to attend. Broken old toys and no bloody resources. Minimum wage even if you're highly qualified, minimum support, maximum effort.
The best thing about the job was the children and the parents to be honest. Even the challenging ones were more positive than all the other parts of the job. It's a shame the love of the children wasn't enough to outweigh everything else.
I'm sure some people love their nursery jobs and have a better experience than I did, but I have yet to find those people!