Think of it like this, you'll have all the stats, and hopefully the gear so you won't die all over the place. Train at higher level areas you could manage, and you'd be getting a job level every few seconds, then later to minutes, depending on how tough of a place you train at until job level X for High Archer, after that, you get to go through the job levels of the snipers, one by one. Though, don't bother with doing anything in LH3 for a while, since Job exp is crappy there compared to other spots.