Give me just the motor, or just the wiring, or just the code, and I am fine. But the moment I have to make all three work as one machine, my head spins. The mechanical fights the electrical, the software expects something the hardware does not do, and I cannot hold the whole thing in my mind at once.
More people experience this than they realize.
You can handle one part, but joining the mechanical, electrical, and software together overwhelms you.
If this sounds familiar, the Library can help you find the bigger picture.