haha, I have never kept them personally but I have kept quite a few picky eaters. The best way to get a snake to accept any food you want is to scent it using the blood and guts of what they will eat normally. It sounds gross but a ton of hognose snakes will eat nothing but toads and frogs so I would squish the toads over a pinky and try and get as much of the fluids onto the pinky, After that it only takes a little tease feeding and they will eat the mouse. Once they have started to eat scented pinks, you can begin to wean them off of the blood and guts simply by using less and less of it each time.
I usually will feed a smaller size than they should be while I am doing this so that I can feed them a bit more frequently to wean them off more quickly. This is also because I am impatient though...
Also, it is way easier to buy the ones that are already feeding on mice. Just let someone else do the work for you. Trust me, it is worth it.