For 3 star you'll need pretty much all classes to 50. When I craft 3 star I use Steady Hand 2 (culinarian 38), Comfort Zone (alchemist 50), Ingenuity 2 (blacksmith 50), piece by piece (armorer 50), byregot's blessing (carpenter 50), careful synthesis 2 (weaver 50), innovation (goldsmith 50). The only skill I don't use is Waste Not 2, and I do use it on other crafts. Getting all classes to 50 isn't that complicated and is very rewarding. You don't have to gear them all. Only my culinarian, weaver and goldsmith are overmelded to craft 3 star at the moment. Carpenter, leatherworker and alchemist have a few melds here and there, my blacksmith doesn't have its militia off-hand and has NQ boots and my armorer is in patrician gear because I'm super lazy.