Which part of 3D animation is hard to pursue pre-production, production or post production? Which part is having most of the work load?

Dear Amit, normally i suggest every one to join a long term course instead of short one , because it gives you a total understanding of the entire pipeline , everybody has some or some inbuilt skills, but for all its not the same . Though there nothing tough or easy when you concentrate and practice

What is your interest as all the steps need hard work.