Drill and countersink pilot holes for screws in two opposite corners.
Cutting a square hole in log siding.
Cut the square place the drill with the point of the bit at one inside corner of the square.
A rotary tool is the best tool for cutting siding that is already hanging.
The block as a guide mark the vertical cuts in the siding with a utility knife.
Set the depth of the blade to about inch and cut the lap siding in small increments.
Hold the siding firmly while you cut it and close the jaws of the snipper only about 2 3 of the way on each cut.
This not only makes a cleaner cut it also makes the snips easier to use.
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Set the block aside and use the knife to carefully cut away the siding along the top and the marked sides.
Using the line you scored with the hammer and chisel as your cutting guide use the circular saw to cut along the length of the line.