Below, I run a drill through a pre-drilled hole... this is not exactly the same as drilling the hole myself, but it familiarizes me with every nut, bolt, and part on the airplane.
Now get the nuts and bolts that will hold this pressure bulkeahd in place.
Move the bulkhead into place.
And tighten the bolts!
OK I did one!
'That is only one bit of work on the bulkhead and one bolt of installation for now, but it is enough for me to know how the system works, and on my next trip out I am sure I will be removing and installing the bulkhead to get to the stuff (like the elevator pushrods) behind it.