You really cannot answer this question without context. In general, it means that the person (in this case, a lawyer) has been the recipient of whatever is being talked about. So if the wider context was about a person being sued for damages, then that would mean that the lawyer has been sued for damages. Or if it was about a person with a broken leg, the lawyer would have had a broken leg. So context is important.

thank you!!!

"a lawyer who has been there himself". It's an idiom term meaning - the lawyer has experienced or lived the same experience as you have/ or going through now. Another simpler term is " walk in the other man's shoes before you judge him".