OP
MDJ
I've done the Job myself for others when an employee and still do it myself now I run a company, it can be very demanding and stressful, especially on a larger company if commercial and industrial works especially if your under time restrictions and penalties and have lots of lazy staff working for you lol, you need to run the work from start to finish within the cost the QS has agreed with the customer and need to work your wholesalers regarding materials as well as manage your team doing the physical work, on a smaller company it may be easier of course.