1. Don't invite too many guests. 4 or 5 girls is good enough.
    
2. Show everyone around and tell them the rules just so they feel comfortable.
    
3. Always be a polite hostess. That means you should be able to know what to do if 2 girls get into a fight just try to separate them and don't let them mess up the whole party.
    
4. Let sleeping girls lie.
    
5. Don't make fun of somebody if they have a certain thing they have to wear overnight like retainers or certain things for bed wetting.
    
6. Try to do relaxing things before you go to bed like watching TV or playing board games.
    
7. If anything bad happens, calm everyone down and convince them that you're going to be okay.
    
8. Don't try to do scary stories unless everyone wants to, otherwise someone could get really scared.
    
9. For picking movies and games, vote and do the majority rule, but make sure you do the other game next.
    
10. Plan what you'll do and make sure anyone who hasn't rsvp'd 2 days before the party can come or not.

I hope this helps make your Sleepover great! =)