as a bike shop employee, you have (and will no doubt gain more) lots of knowledge about highly detailed stuff on the market. most of your customers don't need that and they don't want you to tell them all that - what they want is for you to translate all the stuff they know into what they need to hear. a lot of times, i found, that looks like finding the right bike to suit their needs - combining honesty, knowledge, and figuring out where they're at. not what you'd do if you were in their shoes.

people can get frustrating, but it's not that big of a deal.

figure out how you'd like your LBS to treat you, and do that for as many customers as you can - particularly the rad ones.

come through with what you say you can do for people.

have fun.