Don't have access to the article, but here's one tip, before you remove the calipers from the fork legs, loosen the two allen head bolts that hold the caliper halves together .
They can be a pain once they are off of the bike.
Only other alternative, is to clamp the caliper in a vise between two pieces of wood .
To remove the pistons, use low pressure compressed air in one of the holes, put the caliper on some old shop towels and kinda wrap it up a bit and hold it down, fluid can go every where you don't want it to .