Hi again,
I wouldn't pay to do the course yourself I would say it's best if you can get a job where your employer pays for you to do it. Simply because to become an assessor you have to put a portfolio together of candidates that you see on a regular basis as it all counts as evidence of you doing the job to a certain standard.
It was a external management company that came in to see me about every month, the chap was very helpful and told you what was needed to achieve the qualification and how he would go about it. If I can remember right I think it took about 6 months to become qualified, which is pretty good as you are doing the job all the time so any longer would just be dragging it out.
I do know of some practices that have paid for nurses to do the course as then they can have them train all their trainees but I don't think generally many practices do it.
It doesn't matter if you've only worked in the NHS as the main thing is that you are a qualified dental nurse. You assess trainee nurses in the practices they work plus give them support with their portfolios as all this evidence is then submitted so they can then sit the exam and gain their NVQ.
You have a set of NVQ standards that you assess them against all the time and they have to meet all the criteria.
Like I said it's hard work but very rewarding but I have noticed that dental assessor jobs are few and far between I see lots of health and social care assessor jobs but dental ones do seem to be rare.