[trilinearnz]

Don't over-think it. Jot down several bullet points that you want to talk to, and just write as best you can to those points (without re-writing any of it). Go over it once for any grammatical errors. Next step: post it.

Unless it's something like a thesis, I wouldn't worry about perfecting it. You'll learn more (and get feedback sooner) if you just get it out there and focus on the fact that your next article will be that much better, and the next, and the next etc. Otherwise you'll find yourself accumulating diminishing returns with repeated revisions.

If it truly is something quite important, then consider splitting it up over a series of posts over time.

As for the mindset to be in when writing it, think about what you would say to a friend if you were explaining the concept to them. Over an email, for example.

[yawz]

I would suggest “don’t post it!” Go back to it the next day and read it. Anything sounds awkward? Then edit it. For me the balance is in the number of edits. You can post it after your first edit or you can repeat the cycle a few more times.