[How do I] learn to mod the Infinity Engine?

Or perhaps more pertinent, how did you? Let's say I have virtually no programming or coding (outside of HTML in posts and some less than stellar Wiki editing) experience, middling proficiency with math and too much free time on my hands; is it possible to learn to mod Baldurs Gate, or am I starting out on a Sisyphean task? If it seems possible, or especially if you once found yourself in a similar position, how did you go about learning the basics? What rudimentary skills do I need under my belt before jumping in? Any and all advice appreciated; thanks!