I'm pretty sure all the job quests are tuned for parties, since they're meant to be used in party play. At level, I imagine you would need a full party of 30s for that quest.

If you really want to solo them, get yourself to around 45 or so, which will make everything but the two 45 quests and the 50 one easy enough for you to do. You will still need to group up for the last two or three, though. The 45 AF will send you to an instance that requires a party to get in. The other AF pieces can also be tough to get alone. The level 50 fight is basically impossible to solo right now, unless someone has found some kind of cheap exploit.

Personally, I don't think you'll need the job for much until 45+ anyway, so if you have trouble getting it, don't fret too much. Get that class up as high as you can, first, since you can't start doing endgame content until then, anyway. Experience parties work either way, and you'll want to avoid the use of most jobs when soloing, as they just aren't versatile enough.