Step 7: Drill holes for lights
a hole on the front facing part of each letter that was just large enough to let the light poke through
a hole on the back facing part of the light that was larger, and wide enough to let the lights pass through
I drilled the smaller whole through the letter. Once that was done, I flipped the letter over, and drilled into that same hole, but only 2/3rds the way through, and at a wider diameter. See pics below with notes in case what I just said above made zero sense. And considering my previous background in woodworking, I'm sure none of it was clear.
A little fun trick that we tried (and when I say "we", I mean "Mike all the way")? After all the holes were drilled, we put a dremel bit in the drill pressed and used that as a sanding piece!