Here's a formula I used early in my crafting career which served me quite well. It uses only level 15 cross-class skills. I could HQ pretty reliably using it!

1. “Inner Quiet”.
2. If “Good” condition, “Tricks of the Trade”, then “Steady Hand”. Otherwise, “Steady Hand”.
3. “Hasty Touch” until “Steady Hand” runs out, or Durability is at 20. Anytime a “Good” condition appears during this stage, “Tricks of the Trade” instead of “Hasty Touch”.
4. If “Good” condition, “Tricks of the Trade”, then “Manipulation”. Otherwise, “Manipulation”.
5. Repeat steps 2-4 until your store of CP is too low to do another “Manipulation” and still have enough CP leftover to do the following steps.
6. If “Good” condition, “Tricks of the Trade”, then “Great Strides”. Otherwise, “Great Strides”.
7. If “Steady Hand” isn’t up, use it, then “Advanced Touch”. Otherwise, “Advanced Touch”. Optionally, if CP allows, use “Observation” to try to hold out for a “Good” or “Excellent” condition before using “Advanced Touch”.
8. If “Good” condition, “Tricks of the Trade”, then “Rumination”. Otherwise, “Rumination”. This will give you plenty of CP to finish the synth.
9. If “Steady Hand” isn’t up, use it, then “Standard Synthesis” until the recipe is complete.

Basically, eat every Good you can to recover CP, and use that CP to fuel more Manipulations (durability restoration).

Some things to consider:
- If the recipe is above your current level, it will be MUCH harder to HQ. Stick to recipes of your level or less.
- Keep your gear current, and HQ if at all reasonable to do. If you're leveling every class, making your own gear is an option. Start with your tools (generally Blacksmith makes these), then make the rest.
- Sell everything you make that you're not turning in for leves or whatever. You can make quite a lot of money, even selling NQ gear, which you can then funnel back into your craft. Crafting materials (ingots, lumber, etc) sell particularly quickly and well.