I have taught several of my friends the homebrewing process via example and couching and i think the biggest thing to keep in mind is to KEEP IT SIMPLE. Dont go off into longwinded speeches about how alpha acids in hops effect the preservation of beer if they ask why hops are in beer, give them soemthing short and sweet, and if they have questions they can ask come complicated questions as they go. Dont do things for them, stand near them beer in hand and tell them what they should be doing during this step, and why.
I also tell all my friends that they need to ask questions, because there is no way i will be able to feed them all the information the want to know without asking.
jeff