Re: Moving in to an old house...
In all jurisdictions, that I know of, is a "homeowner" prevented from doing any work he (generic non sexual "he" and not necessarily singular) wants to do as long as it complies with local and state building codes, inspection requirements, and permits. This usually includes immediate family.
It sounds like you are dealing with an old electrical system, perhaps a 60 amp service and you will need to update to a 100 or 200 amp service.
Be sure you live your life, because you are a long time dead.-Scottish Proverb