After the etch and a wipe down with Windex, I wrap the blade to protect it (and me) for the remaining operations. Some people wrap the blade in tape, I prefer to make a simple cardboard sheath.
When the clamp is in place, the bolster pieces can but directly up against them for clamping and drilling. We'll drill into one piece part way, then use the guide to position the second piece and drill the blind pin holes.
Next I'll rout out the inside of the holes with a small diamond ball moto-tool bit and get the pins cut to length.