I want to add a subpanel and run power to a shed in my parent's backyard. once insulated it will serve as an ADU where I can stay while visiting them.

apparently this whole job will cost like $15,000 which is fucking outrageous, how much will I save if I dig the trench and run all the wiring myself and just have the electrician add the subpanel, I can wire outlets and lighting myself as well.