Working by myself hanging large heavy electrical panels I have learned how to make holes match up.
One of the most important things to have are what the call centering bits.
You will see one in the first picture.
Regular bits flex these don't.
They are also ground for standard counter sinking.
I think the rest is self explanatory.
I like do do this in the beginning in case I mess up something and don't have to throw away a bunch of work.
Worth
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