I did write the little months by hand — I have small handwriting to begin with so that wasn’t a challenge for me. Everything in those pictures (minus the title image) was my hand.
I have my bullet journal for my book writing, plot outlining, and other novel related collections. I also use it for my personal calendar and tasks. I have a different notebook for actually writing out scenes, poems, or other writing such as plotting out an article.
My third notebook is actually a planner that I use as my blog/Medium editorial calendar. This is where I have the high level schedule of posts to write, when and where to publish, social media planning, and where I’ve sent to other publications. I’m working on getting a few kinks out but plan on writing about how that is working at a later time.
Good luck with your bullet journal!