Journeyman

The student needs time to digest what they have learned, to consider new avenues and directions.
Although the apprenticeship phase is essentially over, the Master/disciple relationship continues. 
There is still much to learn from the Master.
The Master now watches from a slight distance; allowing the student to find their feet and discover their own proclivities and preferences.

The journeyman should be the equivalent of (or higher than) a 3rd dan black belt in any martial art.
They will understand how to practice the art and be capable of teaching other students.

An Expert will typically open their own class or school.
They may continue to teach on behalf of their Master.
It depends on the individual.

Being a Tai Chi Expert is more than just talent.
You need to put in the work.
The journeyman should aim to make a great leap forward in terms of tai chi skill.
They must begin to see connections and associations between different aspects of the syllabus.
Taoism, the Tai Chi Classics, martial considerations, biomechanics and teaching blend together in a new kind of understanding that transcends verbal explanation.