Most of my pipe moves were learned as a toddler spending time with my dad who smoked a pipe for fifty years, only maintaining one pipe at a time until the bowl split, and only Granger from a pouch. He packed his pipe with the bowl in the pouch loading with his thumb, strictly on automatic pilot. Out of a jar, I have to use my index and thumb, but the same principles apply. You get the right pressure by feel, so don't jam the leaf in there too hard or too much, firm but not so the air won't flow around the ember. As the man said, easy peasy.