Comment by teunispeters

Learn more engineering, any structured engineering. Electronics is particularly applicable, but hardly the only field that fits. Learning to find sources of error, how to handle precision and the systems of organization - all help.

I'm self-taught - could never afford much university... but I worked "odd jobs", such as assistant jobs in land surveying, welding, and electronics - and those all opened my eyes to a lot more. (I do have some university though, as well as a lot of experience... every time I line up to go back to learn more, I end up working instead, for a job I enjoy).

Oh yeah, a lot of basic engineering texts are online, or in libraries. Check them out if you can.