Judging by what I have read/been told it shouldn't be that difficult. The trick is knowing when to put the female in with the male, or at least knowing how to introduce them. I have read about several different ways to do so.
I like bettas a lot and normally have a few females amongst my tanks, but I have never attemped to breed them. All I know is what I have read. There are a few really knowledgeable betta people on this site. I'm sure they will give you plently of advice.