上刀山，下油锅

lit. to climb mountains of swords and enter seas of flames (idiom); fig. to go through trials and tribulations (often, for a noble cause)

lit. mountains of daggers and seas of flames; fig. extreme danger (idiom)

lit. to jump into scalding water and plunge into raging fire (idiom); fig. to brave any danger

to climb mountains and wade rivers (idiom); fig. to make a long and difficult journey

lit. the mountains are high and the torrents swift; to undertake an arduous task or journey (idiom)

lit. to pass over mountain ridges (idiom); fig. hardships of the journey