To add to what the other are saying, you said you felt rushed to come up with a stage plan because you were the first shooter or the on deck shooter. At local matches I arrive about an hour early so I have time to walk the stages before the match begins, this way on the five minute walk through all I am doing is reviewing my plan. For major matches I arrive the day before. Hope this helps.
Personally I like going first on the first stage of a match.