I'm no expert on this- but here goes anyway.Or you can just look at this website:http://beauty.about.com/od/fragranc1/a/different-types-of-perfume.htm. The first thing is- if you are really fond of Chanel, why change it? Second thing. Perfume smells different in the bottle, on a dab of paper, and on your wrist. Perfumes also fade after a time. Third thing If you don't like it- no one can make you wear it. Those perfume sales people are hard core- and will do everything to convince you that THEIRS is the right one. Fourth thing There are dozens of perfumes out there. It could take you literally days to properly evaluate which ones you like. I personally wear Estee Lauder, mostly because I also get my cosmetics from them. They are good--but so is everyone else in their own way. All you really can do is walk around and window shop and- beg everyone for samples . They all have them in little tubes in a card. Then there is deciding what sort of scent you prefer: like floral , fruits, woods and mosses, marine seaweed? and some other stuff.- and it is good to know how the fragrance matches you.... Also, when you try a lot of perfumes, sometimes your sense if smell could get overloaded if too many different samples are tested all at once. It would help to get some fresh air after each time you sniff one type of perfume.
Prices- a pure 'parfum' is going to cost more bucks than eau de toilette, etc. etc. Read the fine print on the cute bottles before shelling out for what you may believe is a parfum- only to find it is mostly water with a few drops of the essence. Good luck!