We are going to be doing a 300 sq. ft addtion to our home. Will basically make 2 bedrooms larger but also be expanding 2 bathrooms a bit by moving one wall about 2 feet. I am going to hire GC to do work. I want to defer some costs by doing the work myself. Once the concrete pad is poured and inside is framed i could take it from there. Would that be stepping on the General Contractor's toes too much?