go out of one's way to do sth

go (all) out of one's way to do sth AND go all out to do sth — очень стараться; прилагать огромные усилия; из кожи вон лезть

Example: You know, I was new there and I didn't know how to get round the building. Paul was brilliant. Though he was very busy he showed me round and he really went out of his way to help me/ went all out to help me

see
[из кожи вон лезть]