No, though that's also worth buying.

Leslie Lamport's LaTeX: A Documentation Preparation System

http://www.powells.com/book/latex-9780201529838/61-1

It really is quite simple.

I set up a couple of templates for articles and books, and frequently re-tag either straight text or HTML into LaTeX when I'm frustrated with existing presentations.

Thanks! There's no need to convince me of the utility of (La)TeX; I am a mathematician. I just hadn't heard the term "the lion book" before.