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Preparing your Gameboy shell is relatively easy and requires few tools. I would recommend having at hand...
Remove the cartridge guard



Remove the two posts shown in the photo




Remove the battery springs

Remove these posts from around the LCD including the raised plastic surrounding the POWER led


Remove the post next to the buttons


Place the Button Bracket / Drill Guide into your shell

Using a small drill bit, drill a pilot hole


Using a stepped drill-bit enlarge the hole to 11mm. Go slow for a better and more accurate finish

Use a sharp knife to remove any excess plastic and to smooth / soften the edge

I sometimes use ScotchBrite to further "sand" the edges to soften them


