House Hackers: What unexpected issue(s) did you have to deal with when starting out?

[Joshua Smith]

I am looking to purchase a small multifamily for my first house hack in RVA early 2025. I have read many books and articles on the subject, but I'd like to hear some perspectives from others who have already started their investment journey: when you thought you were all prepared and put your plans into action, what unexpected and/or difficult issue(s) came up? Did anything throw you off?

Many thanks to anyone who can share their experiences!