Do you do well with books?
I got started on Ian Lloyd’s book, and got “positioning” fairly straight in my head (in a basic way) with the HTML Utopia book (they only happen to be Sitepoint books, I swear they’re not paying me in tasty bon-bons to pimp 'em or anything)… after that, learning through doing more sites and from forums and online articles (stuff like they have at A List Apart etc) was possible.
I was drawing pictures of websites, when my husband said “hey why don’t you just learn HTML and CSS? Any moron can learn that.” (lawlz, but he struggles with CSS) I didn’t even know what CSS was, and googled it. I ended up at DigitalPoint forums where, luckily for me, Dan Schulz and deathshadow and Gary Turner were there to start me off in the right direction (“don’t go to w3schools.com!”).
I made my username based on how stupid I felt learning this stuff, and I’ve lost plenty of hair over both. It seems there’s a sort of “hump” that, once you get over it, you feel confident to tackle any layout, while still finding you’re learning something new rather regularly.
I found that going through Ian’s book, where you build not your own web site but his, step-by-step, helped me get a hang of HTML and really basic CSS.
HTML Utopia I was able to mostly read, as the code was already making sense. I ended up using the appendix C thing in the back for a long time for quick lookups.
Not everyone is a book person, but those two made what I was seeing online make a lot more sense.
Both the books I mentioned are old enough to be sitting in a (decent) public library. Ian’s book (Build Your Own Web Site the Right Way Using HTML and CSS) does have a new second edition out, but I don’t know what all has been changed.