I was replacing a compressor in my fridge during a garage cleanup. I turned off the main breaker, but missed the separate fridge line. My hand brushed a live terminal and I got a sharp shock. Always test with a voltage tester before touching any wires. This quick check can keep you safe on every job.
Always check for level feet before diagnosing other issues.
Oven elements kept failing after my fixes. I figured it was only the element most times. After the third comeback, I made myself look at the control board. Found a faulty relay messing with the power. Now I always check that part too. It takes a bit longer, but stops repeat issues. Wish I changed sooner.
I always had trouble with dishwasher pump motors spinning the wrong way. It meant taking things apart again. So, I made a habit to mark the rotation direction with a marker before removing the old motor. Now, I just match the marks when putting in the new one. No more second guesses. Jobs finish faster, and I look more skilled. It seems so obvious, but why didn't I think of it sooner? Just a small tip that saved me a bunch of time.