Mac Forums

I have a lot of MAC stuff but I usually order online because there are no MAC stores/ counters in my area. However where I got to school there is a MAC store and I'm going there tomorrow. Now I've actually been inside this store before but I've never bought anything. I don't get how you shop? Do you have to tell the sales associate everything you want? I'm going to be buying quite a bit and I feel like it's going to be rude to just be like "I want... this.. this.. this.. this.. this... this.. and this" I don't know plus the sales associates seemed pretty rude last time I went in there. I'm just confused at the whole environment doesn't seem very shopper friendly.
MAC pro cosmetics!