I also started another square and made the same mistakes, and I also want to start another square because we have an empty schedule at the end of the year and I want to do something on the schedule. And I also don't do affirmations in squares because my goal is only to strengthen the chakras.
If you just started a square and made a mistake then unfortunately you'll have to start over when the timing is good for it again. These have to be exact.
Always use affirmations any time you raise energies as the energies need to be directed somehow or they'll go thru the easiest way out and this can cause problems if not directed to be safe and beneficial for you thru an affirmation.
Best not to spread your own energies by doing too many squares at once as this can dilute the workings.