How bad/accurate is self diagnosing?

I do feel like I may have borderline personality disorder. I have read a LOT about it, and quite honestly it really scares me how accurate it is to me, basically everything I read. I can think of multiple examples for a lot of the “symptoms” (or whatever it’s called).

I am working on seeing a doc for an actual diagnosis.

If I have been researching and am damn near 100% sure it applies to me, is it still pretty accurate? What do I do to help myself while I wait for a professional?