A large CP needs to be planned. I don't think the OP is capable of that.
Nice that you can judge me. Just for your information: I partly built our own house myself and have enough craftsmanship skills. Whether you think I'm capable or not is not up for debate here. I find that quite presumptuous.
When I read your posts, I don’t come to a better conclusion. Unfortunately, your contributions suggest that you have little knowledge of the subject. It’s not a problem if you then come to the realization to let a professional do the planning.