With the level 15 cross class skills, and level-appropriate HQ gear (no need for melding), you can fairly reliably HQ any 70 or 80 durability recipe starting in the lower-mid 20's. 40 Durability recipes will be harder and may take some HQ materials.

With this in mind, you are giving up exp per leve allowance by having someone else craft your hand ins. Your call, spend some time crafting (with a decent, though less-than-certain, chance at HQ) or bug someone to make them for you for less exp.

Manuals, I did not try the ones from ARR. The ones you get for HW, I found, I simply could not craft fast enough unless I was using Quick Synthesis. At that point (Birch Syrup from Culinarian, I'm looking at you) the manual offered enough exp/time to make it faster leveling than crafting a bunch of 100% items.

As for the DoL jobs, for Mining and Botany do Leves. Those will go through 50. After 50, if your gear is good enough (and you have 600 GP, through some combination of melding and food) start doing Collectibles, especially the 10, 12, and 2 oclock ones. For Fishing, I found that I got levels at a decent enough clip just fishing, without paying any attention at all to leves or Collectibles. That was 1-60.