Cut the square place the drill with the point of the bit at one inside corner of the square.
Cutting a square hole in log siding.
Hold the block up against the siding s lower or butt edge and using.
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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.
Set the depth of the blade to about inch and cut the lap siding in small increments.
The edges of the drill bit should touch the sides of the square but not go past it.
Drill and countersink pilot holes for screws in two opposite corners.
Between each cut adjust the blade depth so it is deeper by inch.
This not only makes a cleaner cut it also makes the snips easier to use.
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The block as a guide mark the vertical cuts in the siding with a utility knife.