Be careful removing the old cooler, after freeing the 4 screws, give it some gentle twists before trying to pull it upward.
The 212 plus will need to have the gaps between the heat pipes filled in with thermal compound before you put it on. Also getting all the old compound off is important. Rubbing alcohol, 91%, is good for that and Arctic makes a remover that melts it off. Everyone has their own method, just ask and you'll get 6 answers on a way to apply it.