HongKong I did a law degree prior to my post grad primary. I too figured out law was not for me half way through, but I decided that I had already put in such a lot of work that I would stick out my degree. It was the right choice for me.
Over my final two years of the law degree I volunteered at a school and got a part time job as a playground assistant. I appreciate this may be very difficult whilst juggling a nursing degree but experience in at least one school setting is essential for entry into post grad primary.
Also, I'm sure you didn't mean to sound flippant about wanting anything 9-5, but I will warn you teaching, and the post grad in particular, are very far from 9-5. Think up until 2am doing huge amounts of paperwork, followed by a 6am start to get into placement for 7:30am, to be all prepared when the class teacher arrives at 8am. And you'll often be in school well after 5pm.
Finally, my sister wanted to be a nurse all her life and worked in care homes etc from 15 years old. She had a terrible time on the nursing degree and found all the essay writing very hard. She excelled when on placement though. I'm sure it crossed her mind to leave as the essay writing got her down so much. She stuck with it and is now an excellent nurse in a busy hands on department. It's certainly not 9-5 but she has good holiday entitlement and truly loves her job. Make sure you access any support you need, esp. if there's something in particular you're struggling with.
If your determined to move on I suggest speaking with the careers advice service at your uni, they helped me a lot when getting into the post grad primary. Good luck.