I think it depends on who you are. If you are not prone to drama and fright, I don't see a real issue with a certain amount of self diagnosing. I knew what I had long before my official diagnoses, and they did not clash with my own beliefs (maybe I just have good insight).

It meant I could partake in the aspie community three years before the DX. I wouldn't have wanted to just sit back and wait for the all clear from a doc. Also, if I had not really pushed to get the diagnosis and treatment for depression, I would not have been here. My doc was hellbent on that I was NOT depressed. I am glad now I did push it and that I knew myself as well as I did instead of believing her and despairing alone.