Trace, I think it is absolutely essential to work with a therapist who has extensive training and experience in developmental/attachment trauma. The course of therapy can be intense and volatile and requires a therapist who understands the ride and can monitor and weather the attachment/detachment cycles. It really requires a highly trained and skilled therapist who has a solid understanding of attachment trauma.
A therapist who has little understanding or skill in this area is going to be in way over their head and cause damage instead of healing.