drag in a lot of people ⇒ 为这件小事不值得兴师动众。 Wèi zhè jiàn xiǎo shì bù zhídé xīng shī dòng zhòng. → This little matter does not require a lot of people to be dragged in.
无师自通
self-taught ⇒ 他对家电维修可谓无师自通。 Tā duì jiādiàn wéixiū kěwèi wú shī zì tōng. → You could say he is self-taught when it comes to repairing electrical household goods.
良师益友
⇒ 书籍是我们的良师益友。 Shūjí shì wǒmen de liáng shī yì yǒu. → Books are our best teachers and most faithful friends.