How to master CSS
It made me
Smile 
"Learning CSS is imperitive to web design. Learning it WELL is WELL worth it."
How I did it: Practise, practise, practise. Keep trying it out on a web server. Make sites work in all the browers you can think of. And KEEP TRYING. Really now. Just keep going until you get somewhere.
Lessons & tips: The box model and its associated bugs are a must learn.
Resources: The web contains many handy guides. A List Apart is perhaps the best.
