How can I make it easier to get into and out of my car if I use a wheelchair?

Occupational therapy. It would help to work with an occupational therapist to develop and practice methods for dealing with challenges like this. http://www.aota.org/consumers.aspx as your doctor for referrals. These therapists are expert in developing creative solutions for managing daily lifestyle problems. They can help you with not just the getting into & out of car dilemma, but much more also.