Hello!
I would strongly recommend gaining experience as a support worker in an inpatient setting before committing to any nursing studies. This will provide you with valuable insight into the role of nursing staff and equip you with essential experience for your university application. While the role of a support worker is quite different from that of a registered nurse, it will give you the opportunity to observe nurses in action and make a well-informed decision about whether this career path is right for you.
You can absolutely take a break from education if you wish. You could work for a year, or however long suits you, before applying to university. This way, you would be earning money while also gaining relevant experience.
Alternatively, you could apply to university straight away without prior experience. Most mental health nursing courses focus on your skills and potential rather than your background in the field. However, I would highly recommend gaining some experience, as it will help you decide whether a career in mental health is the right choice for you.
Best of luck!