Hi Nutter
Can you do some customer surveys first, before embarking on this and spending money (eg ask your friends/family/neighbours/work colleagues.. That is, if you don't want to employ a company to do some market research to check out the tone of the market, the demographic that you are aiming at, the general characteristics of the area you intend to target: old established estates, new apartment complexes etc).
I do not know the general consensus out there, but I would certainly object to a sales rep appearing on my door step on an evening, cold calling.
Best check it out before you invest any cash, just to make sure that it is not going to be a waste of your resources,
Regards
Nicola