What is the issue?Cutting out a hole larger than the largest hole saw fitting, can be daunting. It is very difficult to hand cut with a jigsaw unless it is very large.
Why address this?In time you will come across a piece of work that the aperture of a particular hole saw will not be able to deal with, or it is a corner piece that the hole saw is not capable of achieving.
How to address this?Boats use portholes extensively and round holes are often required for outlets. All that is required is a flat length of mild steel to make a jig and use it to carve out the hole.
Photo: Michael Harpur
Move the slot on one hole then peg it. Now run the drill through the other hole. Continue to rotate, peg and drill until a round hole is cut. Finish off with a coping saw and rasp if necessary and sand.
Photo: Phil Dolby via CC BY 2.0
With thanks to:Michael Harpur, Yacht Obsession.
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