In all the years I have done this kind of work, the most common mistake I have seen people make is to proceed on their projects without going through a planning and design phase. It is true that some projects do not require detailed architectural drawings, however, most restoration and remodeling projects do and here is why. These details must be in writing so that the contractor can price your project accurately. It s a pay me now or pay me later issue. It s the only way you can discover what you want.
Most people think they know what they want when they start a project.
I can save money by being my own general contractor. Here again, the wisdom of this tact depends on the skills of the owner. I have, over the last twenty some odd years met three or four individuals or couples who had all the skills it takes to be a good general contractor. I have met a vastly greater number who thought they could and paid for their error. It s a business.