Is there a particular order you guys recommend levelling the DoH and DoL classes in? I plan on maining paladin for end-game stuff, but I will play eventually level every DoW and DoM clas to 50 and I want to have every DoH and DoL class capped as well.
I levelled every DoH/DoL at once up to level 40, then did CRP to 50. If you're not interested in doing that, here's what I recommend.
Get everything to 15 first. This will give you the full set of tier 1 cross class abilities. At this point, it doesn't really matter what order you do them in. The key abilities at low levels are Waste Not (LTW), Tricks of the Trade (ALC), and Rumination (CRP). I used these abilities are just about every synth out there up until 50. Rumination kills your Inner Quiet stacks, so once you get Byregot's you won't use it any more.
Next, do CUL to 37. This will give you Steady Hand II and makes Basic Touch 100% and Hasty Touch 80%.
I didn't find out until way later but remember: Cross Class abilities are NOT level restricted. You can use Steady Hand II, which is a level 37 ability as soon as you get your first cross class slot open. You'll get a new cross class slot every 5 levels.
Then, you'll want CRP to 50 for Byregot's Blessing, and then WVR to 50 for SH II. While levelling these 3 classes, you can be levelling BTN alongside as it can gather items for WVR, CRP, and CUL. If you want to add ALC in at this point as well, it won't hurt. BTN also gathers a great deal of the items you'll need for ALC leve turn ins.
For the others, the timing doesn't matter as much. You can level ASM, BSM, GSM and MIN all at the same time and they will complement each other as well. LTW at this time won't hurt either, as you'll need to mine Alumen then Black Alumen to make leather from level 16 to 50.
Fishing can be levelled independently, or not at all. The only thing you'll ever really 'need' it for (crafting wise) is for making Red Coral jewelry for spritbonding, if you're going to do so.
Up until level 20, just try making 1 of everything in the crafting log It will get you pretty much everything you need, and you can make some extras of stuff you'll need for the following levels. Once you hit level 20, focus exclusively on the triple turn in levels at the different outposts. There are tons of resources out there that will tell you which ones they are.
ETA: It is imperative that you turn in HQ items for the triple turn in levequests. This gives you triple the xp. Having those level 15 abilities, and then BB will make this much easier/cheaper. Edited, Dec 10th 2013 6:11am by LebargeX