A Difficult chore Task (I think task would be a better word here.  In English a chore is usually something that we have to do.  example: taking out the garbage or cleaning your room are chores that children sometimes have)

About As far as learning languages is concerned, my English teacher told me it is easier to pass from the beginner level to the intermediate level than to pass from the intermediate level to the advanced level. This is a harder chore task and requires much more time. You have to be willing to sweat and to make fools a fool of yourself when you have to speak. I am fully agree!