no worries at all mate, we all have those days! being in sales I get told a lot worse often believe me - the respect issue is something I try to pride myself on. most of my long term customers are now friends ( invites to birthdays and party's both ways of course ) I believe that if you treat someone how you would like to be treated, it makes the whole process a lot more dignified! I have some technical knowledge, obviously, but rather than lie to a client/potential if I get stumped by something I simply hold my hands up and get one of my specialists to have a chat with them. That way I can be sure of what im quoting will be the best solution for them. unless they have specifically requested a brand or specific kit.