(I’ve) been there(, done that).

(I’ve) been there(, done that). Inf. I know exactly what you are talking about from my own experience.; I know exactly what you are going through.
- E.g. John: Wow! Those sales meetings really wear me out! Jane: I know what you mean. I’ve been there.
- E.g. Sue: These employment interviews are very tiring. Bob: I know it! I’ve been there.