I'm not sure if intermediate is the right description.  We want "Journeyman" to mean good enough -- professional grade. I might describe it as professional-level, or working-knowledge.

The analogy is to a journeyman craftsman -- such as a plumber or carpenter. They can work on their own, where an apprentice can only work under the direction of a master.  The journeyman doesn't have the profound skill necessary to guide an apprentice, but he also doesn't need the supervision of a master.