:)1.1. It is not so easy to set things right. It will take some doing.
I would say EFFORT instead of DOING. But it's OK
set something right = to correct something; to alter a situation to make it more fair
take doing = require considerable effort
1.2. It is not so easy to set things right. It will take up a lot of our time and energy. Why don't you just say "It will take a lot of time and energy." It sounds more natural to me.
Student or Learner