Multiple Tradeskills

[Ravenwolf57]

Tradeskills are one of my favourite things about the game, and I like to level up as many as I can while playing.

But it's been years since I've played, and I forget - what is the point at which you have to choose one to advance with, and leave the others at a lower skill level?

Is it the first one to get to 201 is your Mastery, and then the others can only go up to 200?

Don't want to accidentally do the wrong one!

Thanks