You may already know this, but FYI anyways.
If you have a fixed router, not plunge, and want to cut out holes for drivers, etc.,
*Using a pencil, draw a precision hole on the wood.
*Use your drill with a large size bit, lets say 3/8" - 1/2" and drill a hole on the inside
of the hole you drew.
*Place your fixed router on the wood and insert the router bit in that hole you drilled.
Now you can cut out the hole using the router/jig.
If you have a fixed router, not plunge, and want to cut out holes for drivers, etc.,
*Using a pencil, draw a precision hole on the wood.
*Use your drill with a large size bit, lets say 3/8" - 1/2" and drill a hole on the inside
of the hole you drew.
*Place your fixed router on the wood and insert the router bit in that hole you drilled.
Now you can cut out the hole using the router/jig.
