For me it was a teacher showing his basic web page at the school's computer lab. I wanted to do the same! He showed me how to edit the source in Notepad, and watch the result in IE. To get me started, he gave me a floppy disk with a single index.html file with some tags. I played around with that for ages.
To actually host the page, ~10 old me didn't know what to do. But a relative in Denmark had suddenly become the "webmaster" for her local government, and gotten to learn some stuff.
Remotely teaching me ftp or ssh was out of the question, but I got tipped about Tripod/Lycos. They had an online interface where I could upload a file! And then later she showed me how to apply for dot.tk and have my very own domain. Very cool 8)
Was a bit dormant, though. What more could I do than adding some texts and under construction gifs?
Then the Harry Potter craze hit. Lots of people made cool websites, and I wanted to join! To up the game, me and a friend made stuff in FrontPage. Still manually uploading one and one file through Tripod's web interface. I could do so much more than the little HTML I had managed to do in Notepad! Then I later got to spend a day shadowing a professional web developer, and she gave me the CD for the previous version of Dreamweaver! First I used the wysiwyg mode, but then discovered the editor had auto completion! Suddenly I could write HTML properly.
As many others, my Harry Potter page was a "school" where people could do stuff and earn house points. But not knowing programming, everything was static and I had to manually edit and reupload files. Luckily only like two friends used the page hehe. But other HP pages were dynamic! How? I had to learn PHP!
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As an aside, it's curious how many of those professionals I interacted with the first years were women. Companies/govagencies felt they needed a presence, but didn't care much, and just gave the task to someone else already doing communication/admin work. And they learned on the job and suddenly became the first experts here.