PA can cover a vast range of jobs. What are you thinking?
Employed or self employed?
Big corporate or small one man band?
Working for one big boss (CEO) or a huge team (nightmare!!!)
Private sector, public sector, charity, not for profit?
Office every day or work from home?
Managing budgets and projects or stuffing envelopes in the back office?
How much do you want/need to earn? How do the PA/admin salaries compare in your area?
I'll be honest, I was a PA for very long time and rose to the dizzy heights of the bloke (because I'm afraid to say it generally still is) at the very top of the big corporate. I temped while at uni, moved quite a lot, took risks and managed to become pretty good at it when there was a lot of work about.
However, IME overall the role has changed and not for the better. Expectations and workloads are off the scale. Lots of PAs are now not just looking after one or two people but sometimes huge teams which is ridiculously stressful.
As a nurse, you will have transferable skills to become a PA, but do not underestimate the speed at which you will have to work to keep up. These days it's not just about booking a meeting and typing a letter. It's about managing insane levels of email traffic, multiple mailboxes, calendars which are in a state of constant flux, deadlines, reports, projects, office moves, conferences, travel, expenses, smoothing feathers, herding cats and spinning plates. Like any job, it takes a decent while to work up to that and you really need to hone your processes to keep on top of it all.
I cannot tell you how many pretty young things I saw who were taken on to massage the egos of middle aged alpha males and were then treated appallingly and then fell over and either quit or were pushed. It really is tragic but unfortunately you need the hide of a rhinoceros and the grace/diplomacy of Queen Elizabeth to survive as a PA.
I wouldn't recommend it personally and I have no idea about VA work which I would guess is working from home and managing tradesmen's paperwork and appointments which sounds pretty dull to me!