I’m actually scared of that too! Could you maybe name two or three things where that was the case for you?
By far, I was most fixated on planning the kitchen. Later then also on the bathroom and dressing room. So that everything there is (from our perspective) perfect.
Less attention was given, for example, to things like the positions of the supply and exhaust air for the controlled ventilation system (these need to be corrected in the utility room and children's room), the opening direction of the windows (several windows with the same dimensions, which I was able to have swapped among each other so that the direction is now correct).
Then, for example, that the electrician planned a row of six switches in the living room as two rows of three switches next to each other (this will be corrected :D), and some other placements of switches that made less sense.
Here and there, walls/door positions were removed or shifted on the floor plan. And I’m sure there will still be one or two more things added, and I’ve certainly already blocked some out again :)
Everything still involves effort or €€ at the moment...