Is tai chi easy to learn?

Everyone is different.
Some people pick things up quickly whilst others require more time.

A good tai chi school will have a tried and tested syllabus in place.
By systematically learning one skill at a time, the student gradually accrues information, gains physical awareness and increases the range and scope of their understanding.
But this does not happen overnight.
There is a considerable amount of information to learn. It must be revised, refined, honed and practiced thoroughly.