Hi Groovy
Why do you want to work for them?
Do you know what the salon is like inside, what products they use, what standard of nails they produce, what the people are like there?
Well if you do then there is your answer, ie. lovely salon environment, good quality products, excellent standard of nails, lovely atmosphere to work in.
Why do you want to leave your present place of employment?
Be honest without being derogatory, ie. Better career move, your not happy with the products, how clients are dealt with, standard of sanitation (you know, that sort of thing). Don't say that you don't like your boss (not a good one!!). Anyway I think from reading other messages you have posted, it's more than just your boss.
Questions to ask.
A good one would be something like:- I'm really interested in keeping abreast of new techniques, and therefore do they provide any ongoing training, and if so, is it inhouse or with another company (who?). Point out that you've recently attented a Creative conversion course.
As to taking your brush.
Do they use the same products as you, if they do, take it, if they don't then don't as you don't want to put yours in different products. If you're not sure, then take it, you've got nothing to lose and it may show that you've used your initiative.
With regard to your confidence.
Let them be the judge of that. Assumably you will need to do a couple of nails. Just put your nerves to the back of your mind (easier said than done, but you will really need to) and think that you are just doing a usual client and block everything else out. If they are a nice company to work for they will make you feel at ease.
As for what do you wear?
Wear something smart but comfortable. Is it a trendy place? Be guided by the other technicians that work there. Don't wear something that is restricting.
Anyway, hope some of this helps and wish you the best of luck, keep us posted, Adele