Pickguards are soft, so if you're patient it's easy. Outline the exact hole you want with masking tape, then follow inside the outline, making a slightly smaller hole with an Exacto knife. Go really SLOWLY, cutting short-stroke scratches, then a little bit deeper... once it gets deep enough you can bear down some. Not lots, just some. Once you're through, any sort of combination of small files - needle files, nail files etc - and sandpaper wrapped around sticks and stuff will finish it. It may take an hour per hole, but - so? Work three hours to make enough money to pay somebody to do it, so you can go watch TV for an hour.... :icon_scratch:
(Sandpaper shrapnel likes to scratch things where you don't want :sad1:, so that bears attention)