First of all the best advice in this thread is in the post above! Check out those links.
I'll answer your questions to the best of my ability. Keep in mind while I do keep various carpet pythons, I don't keep bredlis.
Can an adult female Bredli Carpet Python be safely handled by a single person?
Yes.
Also are are Bredlis calmer/less nippy than JCPs?
Some people will say yes. Some people will say no. I'm in the 'no' camp. Just about any carpet python can be nippy when young, but practically all will grow out of it. A commonly repeated generalization about bredlis is that as adults they are very placid. I cannot confirm nor deny this, but the only carpet pythons of any species/subspecies that have tagged me have been hatchlings. All the adult bredlis, coastals, jungles, diamonds, IJs, and various intergrades I have handled have given me no issues.
Are Bredli's sexually dimorphic?
It's hard to look at a given animal and tell whether it is male or female by sight alone, so generally no they are not.
Also is there a pattern or coloration difference between the male and females?
No.
Nick Mutton (inlandreptile.com) is probably THE guy to talk to in the states about bredlis. I highly recommend the book he co-authored, The Complete Carpet Python.