OK here is my 2C ignore as appropriate. I honed my general public skills working as a waiter for 5 years !!

Smile when you enter a room. Don't ever lose your temper. Always appear enthusiastic even if the other person is talking ****. Always use the word "yes" even if you are saying "no whey you're an idiot". Be honest with people in a diplomatic way. That means be honest with out hurting there feelings. Remember you can torpedo an idea with out torpedoing a person. Respect is something you earn and the general public are on the whole idiots who think they are great. They are not being paid to be in the store and you are being payed to sell them stuff. Wether you sell them what they want is up to you however if you leave them feeling like you helped them out, they will come back.

And good luck dude, we will cross our fingers for you !