Agree on what matters before spending the weekend correcting each other’s way of doing it.

Arguments about how something should be done are usually arguments about an outcome nobody described. Two people painting a room, packing a car or cooking a meal each carry a private standard. The corrections start because nobody said what the finished thing should be. Method is where the friction shows, but it is not where the disagreement lives. Five minutes at the start would remove most of the afternoon’s tension.

Before your next shared job, say what finished looks like and what does not matter. Then let the other person do their half their own way.