I am still pretty new to the whole leather work stuff, but one the best cheap homemade tools I came up with was buying a set of semi-cheap wood chisels. The set has chisels from 1/2" to 1-1/2". I sharpened them on a a rough and fine diamond stones then polished on an Arkansas stone, then hit it on my strop. They make great cutting tool for cutting out slots for stuff like belt slots on holsters, just punch two holes and use them to connect the holes.