Self-pollination definitely won't produce anything; pollen isn't particularly difficult to acquire though if the plant has properly developed flowers, flicking the anthers with a toothpick will make it drop pollen on whatever's underneath the anthers (I usually use a fingernail or sheet of wax paper to collect and then use as a platform to scrape it off and move to a different flower). You can also store the pollen frozen so I'm told, to use later on a different clone if you only have room for one at a time. B. liniflora is the easiest to pollinate as it does on its own, aquatica will also very easily self-pollinate but requires manual pollinating of the flower most of the time. The rest all need to be crossed. I just got in a bunch of new forms of the species, hopefully will get them growing and set up a seed stock that I can start distributing from.
Also, it's a bit touchier as the resulting plants can be a bit lankier and less appealing to look at, but most of the Byblis species can be propagated via stem cuttings. The perennials take to this method best 9and thus far are also the ones that care the least about if roots are damaged in transplanting etc.).