You have the choice to move on or, if you feel that it bothers you so much, stop and start over again. How you feel is far more important than the right order or other things of secondary importance (such as the previous question). Being tense is not going to help you with your magickal operations. With that said, I don't mean that magick is so simple and it can be taken lightly. You have to work with discipline. With that in mind if you forget something, follow the aforementioned advice. Always make sure you are comfortable with what you are doing.