Over the years of writing computer instructions and working on the projects here, I've found that editing your own work is the hardest thing to do. Your brain knows what you want to say and just fills in missing words or overlooks mistakes that you could easily find in another person's work.
I know that when I was doing my list of my own mistakes above, I found another 4 or 5 misspellings, even after going over the adventure multiple times before this.