Your about 90% correct. Everybody has their own system but I found that instead of drilling all the way thru on the first set, is to not drill all the way thru
the bottom side until after the epoxy is cured. And you can use the size drill as the finish size.
Also take an old small allen wrench, cut off part of the end, and route
out some of the core
, and vacuum out the excess debris before filling with epoxy/filler.
And it's best to fill from the bottom side up with a syringe, to help keep out the air bubbles.