Quote Originally Posted by Gemina View Post
Tradecraft leves are the fastest way to level your crafters without question. However, they are limited to allowances and you can burn through them quite quickly if leveling all the crafters. For this reason it is important to turn in HQ only as they give a large bonus to exp. GC turn-ins are great too, and again, be sure to turn in HQ.
Once you unlock them in Idylshire, Custom Deliveries provide very quick crafter/gatherer leveling.
The problem with them is they are even more limited than levequests: you can only do at most 12 a week.
And unlike GC missions and levequests, you can't buy (or have someone else make) the turn-ins for Custom Deliveries.