The hardest part I found about being a manager was the lack of a feedback loop. I could never tell if I was doing a good job, or just coming up with bandaid solutions that were going to make things worse in the long run. I took a lot of satisfaction from supporting my team and seeing them grow, but not having those clearly identifiable wins which you can attribute to a specific action can be hard, especially when the losses are so much clearer (It certainly wasn't great for my self-esteem!)