I thank that you maybe it is hard to get over making the initial mistake, that you keep seeing it as a mistake instead of the road taken unlike the road not taken, You are doing awesome!
You can always have a headache when others are involved, especially when there is a chance that they will mess up the layout, it isn't to bad when the pins are still in but once they are out it can be a disaster, I generally pule the pins on the rows that I am working on and leave all the rest, I have had lots and lots of help here in the sewng room.