take apart one of those mini personal fans and rip the foam/plastic off the metal blades, and then screw the top of a small box onto it, (i used a pencil shaver box since the top twists on and off) and you have a great, portable grinder that fits in your pocket.

How much i want to grind the weed depends on the situation. i dont usually grind mids and schwagg, but with nugget if i want to smoke quickly, or i feel like having one monstrous hit, i will grind it almost into a powder and one good hit will kill the bowl, which, though it sounds wasteful, will be a MASSIVE hit which will get you insanely high in a matter of seconds.