What to avoid:
[*]Fundamental mistrust
[*]Blind trust
[*]Nervousness
[*]Making phone calls or writing and sending messages in the midst of one's own excitement
[*]Not asking questions that arise - no matter how "stupid" they might seem
[*]Being satisfied with answers even though the question was not answered or the answer was not understood
[*]Trying to understand everything better than the experts
[*]Failing to acquire a basic understanding of the trades
[*]If you have calculated tightly: spontaneous planning changes during the construction phase
[*]Accusatory diction
[*]Looking for someone to blame instead of looking for solutions
[*]Not taking time for site visits (also during the day)
[*]Forgetting to thank and praise
[*]Ignoring the workers on site and only speaking with the bosses
At our first build, we were very busy - the second child was on the way and during the Dotcom crisis I had to find a new job three times during the construction phase. We took too little time for close contact with the construction site and the people. The result was decent (developer townhouse and interior fit-out managed independently) but some things could have gone better. We should have checked the statements of the saleswoman more carefully, then we would have gotten a better located house and moved in earlier. The woman simply lied to us.
With our second build, it was the opposite - I suspended working for a few months, resumed in a reduced capacity after 3 months, and took all the time needed for site management, presence, and good mood. I cannot say what mistakes we made because neither significant errors nor defects occurred. We probably also had a good eye when choosing the construction partners. Only the electricians were very slow and unresponsive.