It's also a ton of EXP for some (admittedly dull) busywork. Doing the full suite of quests once you start getting up to rank 4 or 5 will get you 2-3 levels a day all the way up to 40. It's like getting six or seven extra leves a day.
As far as leveling order goes, I'd recommend doing them all simultaneously via GC turnins, while prioritizing:
-CUL to 37 for Steady Hand II.
-CRP to 50 for Byregot's Blessing.
-WVR to 50 for Careful Synthesis II.
-ALC to 50 for Comfort Zone.
Even pre-Byregot's, you can HQ a lot of the turnins yourself, even without HQ components. My typical pre-Byregot's rotation for low-level stuff was something like:
• Inner Quiet
• Steady Hand II
• Hasty Touch x4
• Master's Mend
• Steady Hand II
• Hasty Touch x4
• Master's Mend
• Steady Hand I + Basic Synthesis until finish, or Steady Hand II + Rapid Synthesis, depending.
Throughout all of this, use Tricks of the Trade whenever it pops up. This gives you more than enough CP to use MM multiple times. I preferred using Master's Mend over, say, Manipulation, just because getting a Tricks proc during one of the Manipulation charges was a bit of a pain.