What are the major pitfalls for beginning project managers?

The following are the areas where a new project manager shall fall in a dilemma on to what decision or step to be taken:

• Trying to execute the tasks in hand rather that managing them
• Overdoing
• People management and soft issues - Managing work done by people or people themselves ?
• To compromise of Cost or Quality or Scope or Time?
• Dealing with Client requirments?