Well. I guess the first tip is make the right first impression.
Arrive at least 10 - 15 minutes early. Any earlier and you look desperate, dont even think about being late.
It's a beauty counter - so make sure your appearance matches the atmosphere. I suggest a natural makeup palette, hair up (bun or pony tail), nails short and painted neutral/pastels. Wear a skirt with low heels or slacks with flats but with a dressier top (not flashy). Think corporate casual. Keep jewelry to a minimum. If you're not sure, I suggest going to Macy's before hand checking out what the girls are wearing and try to match their appearance. If I were the manager, Id say I would start there.
Carry a copy of your resume and make sure its spotless and error free. Have a friend double check it for you. Print it on good stock paper too. When I worked HR the resume was always the first thing we saw and we judge based on grammar, spelling, and quality. Sometimes the resumes didn't get past the circular filing bin (garbage pale).
The basics:
Strong hand shake, but not too forceful. Big friendly smile. Most of all be sincere. We can smell a faker a mile away. Nervous is okay and if you find yourself fidgeting, just admit that you're nervous and explain that this opportunity really means a lot to you. That will sometimes break the ice. Know why you're there and avoid using the words "like, um, and I dont know." You might now know about the product, but you should know enough to carry you through a decent conversation. Know your facts, where you worked before, why you left, etc.
When the interview is over and she asks if you have any questions - have one! Even if she's answered everything you were thinking about in your head, think of one more. Having a good back and forth conversation with the hiring manager is important.
Avoid talking about hours/salary/discounts/etc. They'll get to that on their own.
Other than that... I cant think of anything else!!!LOL!!!
If you're wondering where my rambling comes from... Im an office manager now and have worked retail all my life.
Be yourself, be honest. Good luck!!