I have to lv up crafting class till lv19 just to complete 1 enhanced-dagger quest -,- .

yup, but how ? i went bonfire camp the npc shows red sign and ask me to train a lv19 craft.

AF+1 is the best of the best. Only Allagan is on par with it and you get that in Bahamut Coil. So far only 1 guild in the world has entered Bahamut's Coil.

Your gear progression should be:

AF -> Amdapor for Grand Company Level 50 weapon unlock + Amdapor gear max melded -> Ifrit HM + Darklight gear (buy with philosohpy tomes after you get enough for your Relic weapon) -> Garuda HM -> Titan HM -> Finish Relic Weapon -> Allagan gear (bahamut) + Relic+1 (3 weeks of Amdapor) -> save mythology tomes for each of your af+1 parts.

If Amdapor is too hard for you, do Wanderer's Palace to get ilvl55 gear. Amdapor is ilvl60. Darklight is ilvl70. Allagan and AF+1 is ilvl90.

If you minmax your amdapor gear, it should last you through to Garuda and possibly Titan HM. You should be getting your darklight gear by Titan so keep running amdapor each week till you cap mythology tomes (300, 40/run) and then do praetorium if you have enough ppl.

You can but its very difficult. Groups have reported barely beating the content with just AF. When in doubt, do WP before AK.