I'm in the process of submitting plans for an extension to my house, a very simple two story box. It would be the first time i have had any major work done. I'm thinking about running the job myself and contracting the work out to the various trades required rather than getting a builder to carry out the whole job. Has anyone had any experience in doing this and if so how did it go? The main reason for doing this would be to keep the cost down knowing that most builders sub contract most of the work anyway and I would be able to do some of the work myself. My only worry would be the amount of my time it would take up and the stress of keeping the job moving on. Any past experience or advice would be great.