i had originally self diagnosed myself with autism & adhd before i eventually got assessed for both, and diagnosed. i think it's good to do extensive research, and that's how most people come to the conclusion that they may have some sort of disorder, and then go on to get assessed for it. i would never have gotten diagnosed with autism (and other things) if i hadn't suspected myself having it in the first place. i personally don't see much wrong with self diagnosing, especially if you can't get therapy or tested, but i have seen a few cases online which seem.. excessive.