乞丐趕廟公 : It especially used when a Guest overwhelming the host. 班門弄斧 : 班(Ban) means 魯班, a master of architect and carpenter. It means playing an ax in front of Ban's house,also means show of in front of the master

where is the hammer? I will break them down:) 身处鲍鱼之肆，久而不问其臭：it’s from Confucius saying: 与善人居，如入芝兰之室，久而不问其香，则与之化矣；与不善人居，如入鲍鱼之肆，久而不闻其臭，以与之化矣。Your sentences are part of it, and literary meaning is: stay in the fish market long time, you won’t smell the stink. Implied meaning: If you always hung out with bad people, you would realize how bad they are, and will be one of them. 鸠占雀巢：from ShiJing (诗经)。literary meaning: dove take sparrow’s nest. Implied meaning: taking the other people’s place or position. 乞丐赶庙公：literary meaning: beggar take the place of the statue in the temple. Implied meaning: not important people or matter take the place of the important one. 蚕食鲸吞：from JiYun’s poem, Qing dynasty. literary meaning: eat like silk worm, eat like whale. Implied meaning: conquer or invade in anyway. 班门弄斧：literary meaning: play around with the door and the ox. Implied meaning: actually can’t do anything, still show off. 情窦初开：from Qing dynasty, Li Yu’s poem. Means: someone fall in love (with somebody). 塞翁失马，焉知福祸: from a legend story (寓言）：塞翁失马。( old man Sai lost his horse). It means: misfortune might be a blessing. 鬼灵精怪: is not a idiom。It’s a noun which means all kind of ghosts, wizards, witches..