What are common mistakes that new or inexperienced managers make?
So at one point I took on a management job, stepping up from a (lead) developer. I felt like the whole thing was kind of a train wreck and I am still slowly analyzing the black box recordings from it. This was my first time having direct reports that were not one or two interns and managing a team of seven other highly intelligent people was quite a chore in itself. What bugged me is that I could never tell if the problem was the environment or something I was doing. I tried to be fair. I mentored people when I could help. I tried to not be overbearing when I had nothing to add. I present challenging problems to the people who I thought would find them interesting. I advocated for my guys to the upper management, trying to improve working conditions. I insisted on being flexible, discarding what was slowing us down, and adopting what was good. None of that seemed to help: my dev team learned to resent me for delivering the bad news (for example the dev team was the fallback for doing data entry for weeks on end when nobody else could handle it and we had no time to finish better data entry tools because of it), and my boss(es) learned to resent me for not delivering what they expected.I know that there were quite a few problems above me. Lack of leadership carries far and wide and there was a disconnect between what the products did and what the management thought it did. Lack of money (think lack of compensation, lack of tools, lack of time for anything but immediate returns) did not help either. I do keep questioning whether I was doing all the wrong things or if I was put in a situation designed for me to fail, or perhaps both.After I left I understand the company hired three different people to replace me: a manager, a dev lead, and a support engineer. I suppose that's some kind of a sign that I was trying to do too many things at once. Most of the engineering team also left after I did. The least I could do is give them the great recommendations they all deserved so all of them moved onto exciting new pastures. However, I cannot help but feel like I failed at this task that I felt sure I could tackle and I don't understand why.Please excuse the rant. These types of topics always trigger those same feelings in me.Edit: now I work as a developer on 2-3 person teams. I have no reports. I get to be productive again! I can write code that doesn't have to suck to compensate for poorly chosen deadlines. This is good for the soul. I do miss leading a team though; not managing but really leading. One of my proudest moments was when I was allowed to follow a system of estimates and sprints I put together and for 8 weeks my team delivered on schedule and exactly what was promised. That was one of my more joyful moments.