I would change a bit galborion answer
You have gatherer then gather and craft yourself

Everything can be done by yourself

I was head Crafter in ARR but went to the same levels as the other once HW started
Had to rework everything to reach 60 then spat on the red script stuff which is mostly crap
And work hella more to gather and craft my own 2* stuff HQ and meld it

...

By the way hw leves are not good
Do not do them if it cost too much (which is the case in almost every Crafter except alc and cul)

The best way to level up is daily grand compagnies items
And make your own shit exp (all comp give exp once you craft them)