Well, I learned HTML partially via editing Blogspot
templates for my own use. And I know of many others who do as well.
All you need when editing one is just a little logic and
creativity, and maybe patience - no prior knowledge
is required.
HTML is easy... I learnt it that way partially.
I find that XML is different... and the same logic seemingly
doesn't apply to XML. I broke more templates that I create. LOL