What mistake did you make during your first year of home ownership?

Hi guys,

I don't want to post what happened because I'm still a little upset about it, but my boyfriend and I bought our first home about 8 months ago. And we fucked up. The good news is, there's no real damage and the item that got destroyed doesn't have to be replaced. We probably will though, because it made the backyard very enjoyable. The bad news is, it was preventable if we weren't too distracted by setting up the rest of the house. So, what mistakes did you guys make when you first became homeowners? Also, does anyone have any tips so we can prevent future migraines? Bonus points if these tips involve preventing accidental damage to an above-ground pool. It wasn't involved in all of this, but if we're upset now, I can only imagine if we fuck up the pool. Thanks.