Haven't done it myself, but in general you need training and to pass an exam.
Training can come from 1 to 4 years of schooling, apprenticeship, or I believe job experience (e.g. general contractor for many years). Once that has been satisfied, you take the certification exam and pass to get certified.
Ah, I wish you could just show knowledge without the formality of schooling or an apprenticeship. Way too much effort for something I only have a passive interest in. Appreciate the response!
Training can come from 1 to 4 years of schooling, apprenticeship, or I believe job experience (e.g. general contractor for many years). Once that has been satisfied, you take the certification exam and pass to get certified.