I have finished the research for my next book. I then divided the remaining work into three sections: x-y axis, z-axis, and then explain what it all means. I have finished the mathematics and more than half the writing regarding the x-y axis. I had most of the mathematics finished on the z-axis, before I determined the tool I was using was not going to deliver the results I hoped it would. Even so, having done the z-axis mathematics once, it will be much faster doing it a second time.
I am making good progress.
This is especially good progress considering that only six weeks or so ago I had no inclination towards taking on this task.
One step at a time. I budget some time every day to work on this, and every day something get done.