Your character

Self-knowledge can allow you to compensate for weaknesses, make use of strengths and help prevent bad things happening by accident.  A few specifics: 

• Humor: smart aleck is acceptable, sarcasm is not; teasing is acceptable, put downs are not.
• Moodiness – We're all moody in some form or other. What are your negative moods that can affect your ministry?
• Do you have someone that can objectively point out when you are being moody?
• You cannot quickly change your feelings, but you can change and control your behavior. If, for example, you are angry beyond what is called for by a situation you can say so out loud, and refuse the temptation to take the anger out on the kids. Privately bang on a wall or throw something if you need to...
• If you are feeling depressed or discouraged, work through it in an acceptable fashion, but don't make any rash decisions at such times.
• When exhilarated, don't make any rash promises either. Just enjoy those moments.
• Know your “hot buttons” so you'll recognize when kids are trying (consciously or unconsciously) to get your goat. Explicitly state that this is a hot button and that you are really mad, but you aren't going to let this change the situation. Then walk off to cool down. 
•  Let it be known that there are certain topics or situations that are off-limits.