Without perusing the thread.

Everything to 15 is cheap, the guilds give you shards just for joining, and you can make every recipe through 15 buying ingredients from the guild vendor. Except for cooking, the guild doesn't stock fish but there is a fishmarket, the hayline (sp?) just off the aftcastle, that does.

You get your tools and much of your crafting gear from guild quests. And by leveling everything in parallel you get materia.

Save what you make because some of it will be used for levequests and / or GC delivery quest turnins.

You can start the ixal beast tribe quests as any crafter L 1 or better and that's another way to level up. Also they have a turnin quest, which you will probably have made stuff for.

My recommendations: Everything L 1 - L 5, do the L 5 guild quests, check the levemetes in each city for levequests, check your GC for GC turnins, get the Ixal beast tribe questline started, do their quests turning stuff in on your lowest level class.

All that is a bit over 2 hours mostly due to starting the Ixal questline.

Then all the L 5 - 10 recipes, do the quests, check for levequests, followed by all the L 10 - 15 and the L 15 quests and levequests.

If you do that last set over two days, with the GC turnins and the Ixal quests you should have everything to L20 or close to it.