When in doubt, sit and have a cup of coffee. There are times when we are stumped, misled, in a conundrum about how to do, how to fix something (and there are always things to fix). To have the patience to know when it is time to stop and have a cup of coffee, however, is a talent that many do not have.
It takes perseverance and patience to know when it is time to stop.
What is the teacher that teaches us such things? Anger and frustration. Things don’t care and the universe (especially physics) has no aim or motivation to make our lives miserable. We do just fine at that without any help.
When to tool slips, the nut strips, the puzzle just cannot be figured out…take a break.
On a farm it is easy to get wrapped up in the endless maze of chores, of work, of reparations. But, having lived a life both in the professional and agrarian world, the endless list of things to do differ only in type, not amount.
And so take a break, grab a chair, have a coffee, get a nap; do what you need to do to figure out the problem. As many have found out: many a puzzle has been solved in dreams.
The Armchair Philosopher 
I wholeheartedly agree and just took a break from trying to explain various kinds of stonecutting (wedge and feathers, guillotine, diamond wire, argh!) in a writing assignment. I went outside and watered my gardens.
That’s one thing I’ve always admired about what you do: the built-in need for curiosity. You must be one helluva researcher!
Thnx for reading.
The natural world is a great teacher; I find it easier to get out of my own head when tasks are physical.