Vinyl siding replacement and existing light fixtures
Normally the contractor removes the fixtures and outlets. In most states you do not have to be a licensed electrician to remove replace existing fixtures and outlets, (I believe there are a couple that may require it from reading different forums). You do want the siding company to mount the fixtures or they may end up looking bad. The siding company has the trim and experiance where an electrician may have no experiance with the siding type.