For small time growers who want to breed some seeds for fun then i have a simple little program, obviously nothing like the big breeders but in reality the process is similar and generally works.
So let a female plant fertilise another to get seed, try to select a female plant that shows the least hermi trait for obvious reasons. Take the seeds of this plant, will all be feminised, and germinate all of them or as many as you can. Kill weak seedlings and slow growing ones only keeping the best and fastest. Next veg them and just select the best to flower.
Before flowering take clones of each plant and lable them up so you know which flowering plant each clone came from. Now when the flowering plants are finished kill all clones except the ones that came from the finished plants after flowering that showed strongest and best yeilds.
Basically you are trying to select the desirable traits that you want in your strain and breeding these traits only, breeders make it more technical but still they are just selecting the genetics and traits they want and like. people think making a few seeds is bad but can be real good fun if your not bothered about loosing a few plants and spce in the grow room, even bud with seeds in still smokes good and yeilds big, except for all the seeds obviously.
Dont hate seeds, its just natures way, top breeders breed out so much of the genetics of weed it is bad for the genepool, in nature there are so many crosses and different strains and when they all mix the genepool grows a lot and keeps it healthy.
Common misconception that the hermie trait is bad, to some of us growers it is just another amazing and fun feature of the great ganja plant, people frown on it where as i love to play around and try all different things, why be scared of making and growing your own seeds, eventually you learn how to and what to do and hell basically you are mother nature at her best.
Was it the seed companies who told you not to breed your own seeds cause i say screw their ridiculous prices and ill fail at making my own, im only into growing weed for fun and hermie plants are damn sure a lot of fun to play about with.
P.s. this guys plant looks a bad hermie though, i would avoid breeding with it but would still grow out the seeds for the hell of it, best strains have come from the biggest mistakes and fails generally.