Regardless of whether you will have a new staircase from /fakro_lestnica.PHP or the ceiling is repaired, you still need to invite professionals.
You probably ask if there is really no conscientious, sensible and honest workers in nature? Of course, such people meet, but when they get into the brigade, they have to adapt to the entire team. Such a person is not selected in the foremen, since due to his decency, the whole process of work will stop and interfere with the embodiment of the main task — to earn more, work less. For the role of the foreman, a psychologist and dodger, who knows how to bargain and to confidence in the employer, is to rub and shout into workers (for species, with you). This is a reality and it should be taken into account and understand. And why builders try, if the employer himself is poorly versed in everything, is interested and cannot at all evaluate the quality of work?