Just buy new blades for your tricks. I made a tester out of a square and some elastic bands. You push your broadhead through and when the rubber bands get cut off, you know they are sharp enough.
I use sanding paper, grid 1000 and then grid 2000, just strike any blade a few times both sides and they get sharp.
There's some good tutorials on sharpening blades on youtube.
But best way to sharpen is to use japanese waterstones but they are expensive, same as belgian cuticole claystone....