Yes, the Superfeet [TM] Green insoles needed to be cut to size, and being costly I did not want to cut them too small.
The carpenter's rule is to measure at least twice, cut once.
I made separate R & L side templates from cardboard, which I cut to shape in small increments until they fit snugly in my boots all around their full perimeters, then traced the template shapes onto the Superfeet, then cut the Superfeet smaller in increments approaching the marked lines with multiple trial fittings until they too fit snugly in my boots all around.
Because the cut edges are snug against the insides of my boots, my feet cannot contact them, therefore, no chafing.
Using my tin snips, the whole process was easy and took about 10 minutes per boot.
I can remove the Superfeet Greens for periodic cleaning and inspection, but doubt I will need to replace them for many years if ever. They are of robust manufacture.
Edit: If you use the cardboard template system as above, it might be prudent to mark the templates "left" and "right" to avoid mix-ups.