After a couple of weeks of casual research I (surprisingly) grew even more excited about the idea and decided to start working on it.
First I had to actually build and publish my (manually made) blog, so I could have actual experience with blogging and understand the problem better.
Then I started designing the thing. Mostly obsessing over typography for days, defining some basic branding, and starting with the app and the blog’s design.
Only after around three weeks—with 90% of the design done—I started development (first commit was on June 27).