Pet Care Needed - Full-time / Part-time

My Breanna is 16 years old and may need to sit for some of the process. She is a longhair mini dachshund and the sweetest, most gentle girl in the world. She needs mats removed from her thick fur and a sanitary trim for her back end. Id like to keep the end half of her tail, feet and ears as feathery as possible while still getting the mats out.