No wonder I feel bogged down. Installing the offset toilet drain took me several hours across two days. Not predicting well how much standing drain pipe I needed, I cut a little bit of pipe at a time using a dremel tool and cutoff wheel at least four times until the lower pipe set mostly inside the drain. Then I needed to chip out concrete to allow the offset part of the drain to sit lower in the concrete.
It took time to get the drain to set level.
Front to back was more difficult than side to side because it involved chipping out the right amount of concrete. I had a hammer and cold chisel and protected hand chisel but the angle was restricted by the rear wall. Finally it was the 5# hammer by itself that chipped away enough concrete to set the drain.
I finally got the drain to set within 1/4″ or so of the floor. This type of drain is supposed to set above the floor, but I didn’t want the toilet to set above floor level so I recessed the drain.
This offset drain worked to get the toilet to sit far enough forward from the extra polyiso insulation we used on the exposed foundation walls.