Your Experience With First Time Managers?

Employee promotions are an integral part of the corporate hierarchy. When an employee spends considerable time at one position and acquires necessary skills -he/she is promoted to the next higher level. But this system has its downsides as well.

When engineers get promoted to 'management' position (say project manager) they develop a new sense of authority that they have to 'control' the juniors. They are also exposed to the real-life challenges where no ready-made answers are available and 'people management' is one of the toughest things in this world.

So do first time managers fail in handling their responsibilities? Share your experience of working with the first time managers and if you have any suggestions for them, you can post them here. I'm sure many first time managers would be reading this thread.