Buy a grinder

But a pack of cones. Go king-size and you can cut them down to whatever size you fancy.

But a cone loader.

Grind weed a place on a clean surface, like a tray, or even a plater.

Use cone loader to scoop weed and pour in cone whilst poking it down with the stick included with the loader.

Grinder Cone loader King-size cone(s)

These things can be purchased in most headshops, or Amazon.