This was my week to start my tomatoes, indoors.

One variety I started was brandywine, which I'm pretty certain is not a
hybrid. Since the packet contained very few seeds, I started thinking
that perhaps I could harvest some seeds this year, and save money and
have more plants next year. I know tomato seeds seem to pass through
the digestive tract and survive, but I'd rather find a more pleasant
way to get the seeds.

So what are the steps to harvest tomato seeds, assuming I'm willing to
sacrifice one or two of these fruits.