Esther,
You shot well. Even though everyone had their share of misses, etc... today, you hit when you aimed (for the most part) and you were safe shooting each stage. One could not ask for more. All of the above issues go away with the experience, some of which you have just started to collect.
On #4: You owe David an even bigger thanks than that. Remember what happened on stage 4? or thanks to David, what might have happened but didn't.