I can't speak to Premier but do sell with another jewelry direct sales (Lia Sophia)... for me, it's my "play money" as I work full time teaching.
I did it to be able to get my own jewerly at a VERY discounted price (think 70% off the catalog) ... sell to my friends ... and the "extra" money is a bonus.
My advice would be to make sure your "upline" is a strong support and make sure she can help you reach your goals with the company. People get into sales for various reasons== extra income, getting out, free product, etc. You need to have a supportive upline who can help you reach YOUR potential and goals whatever they may be.
The other thing I would recommend is to GO to a party that she is having and watch her-- then ask yourself if YOU could do that. It will also help you learn more about the jewelry/company.
The other thing I would recommend is to make sure it is something YOU would use yourself. Your customers are going to be more likely to buy from you if you are selling them a product/company YOU believe in. If you find it is not for you, keep looking--- there are TONS of direct sales companies-- if jewelry is not the one for you, perhaps a scrapbooking, cooking, housewares, candles, etc. might be.
Being able to set your schedule, earn extra money, is a GREAT plus-- with any company you will find people who make LOTS of money at it, but any of them are hard work. It depends on how much time YOU are willing to put at it growing your business and making it work for you.
Best of luck to you with whatever you decide!!!