It is very scary. Oddly that makes blogs kind of a good place to start, since almost no one will find them or read them. It's public writing, but a lot less nerve-wracking than putting yourself out there in other formats (like forum posts).
I don't consider myself a writer, but it sounds like you do.
I find forum posts far, far less nerve-wracking than a blog post. For me, a forum post is almost like how the original article describes a chat: it feels closer to realtime, and feels easier, because it's just like playing a normal role in a conversation. It's normally a response to something, expecting a response.
A blog post feels closer to a formal publication, and I feel like they're more expected to stand on their own, without the justification and context helpfully provided by others' posts.
