Русско-английский словарь пословиц и поговорок
ЧЕЛОВЕК САМ СЕБЕ ПЛОХОЙ СОВЕТЧИК
When in predicament, you should not rely only on your own opin ion to find a way out
Cf:Не that is his own counsel (lawyer) has a fool for a client (Br.). A man who is his own lawyer has a fool for a client (Am.). Only a fool is his own lawyer (Am.). Self is a bad counsellor (Br.)