Without a primal therapist, or better yet, a number of primal therapists, many traumas will not be accessed or accessed incompletely. Let's face the truth. It is essential to learn to primal with a buddy and even alone. One can be one's own worst enemy. It should not be a surprise for self-primalers to learn that their own defenses can keep them from accessing crucial material, or accessing it incompletely.
All primal therapists have therapists.
There is a limit to self primaling and that limit is reached early in one's self therapy. Many began self therapies inspired by their works or Alice Miller's writings.