I would hope to save 20% or more if I was building my own home, which I have done. If you are even remotely in the business, you can do it. It’s not bad and most subs are going to give you grace if you need advice seeing as how it’s your own job. As long as you aren’t building in a random area you have no ties, you should easily be able to round up the subs through your contacts to complete the job. Not to mention all subs know subs and they have guys they work with all the time they would recommend. Unless I was pressed for time, if I were consulting anyone who has the basic knowledge in construction (and business) I’d tell them to build themselves.