Hardware...

...when it goes wrong, where do you start?

You have to step back and look at the big picture. Then you have to test every logical possibility. It does take time, but it's best to make sure that every combination has been checked.

You have to have things planned, in place and know that they're safe. Then you can move on, progress, go forward.

It just takes time, patience and understanding.
If you build it...