Job hunting is always a majorly stressful experience IMHO, Mustang. I would try real hard not to take it personally, though I know that is easier to say than do.

I don't have any experience with selling security systems. But I do know a bit about sales jobs, having sold insurance for a year back in the 80s.

* Is this something you do by phone or by personally calling on businesses?
* Do they give you a base salary or is it strictly commission?
* Do they give you leads or are you on your own to find your prospects?
* Do they offer a training program to teach you how to succeed?

Business to business sales can be very lucrative, but it is a very different "animal" than working a job as support staff for a law firm. My best advice is to really analyze what's involved and then ask yourself if you feel it is worth giving it a good college try...