[0-60] - Go to Bastok , grab some acid bolts, and start killing the worms/bats in Korolokka Tunnel. You don't need to do this as THF, you can go as your WAR and pop off the cheaper bolts to lower the cost.
Unlock the RNG job if you haven't already and level it to 10. Use a Mithkabob at level 1 and you shouldn't even have to go into attack mode for the first three levels. This helps by leveling up your RNG to use as a subjob for skillup parties later and skilling up a ranged weapon at the same time.
-Level Range- 1-75
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[50-80] - If you're in Jeuno, just grab a stack of bolts and go over to Quifim Island . If you're doing this with your THF, target Clippers and Giants since they have a hard time with accuracy. If you've got to go with status bolts try use the bloody bolts. Acrophies will be the top end skillups in Quifim.
-Level Range- 30-75
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[80-110] - Head to Garliage Citadel and work on Wingrats and Borer Beetles. I prefer Beetles since the drain on boody bolts are good on these.
-Level Range- 50-75
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[110-140] - Garliage Citadel again, but you'll want to drop down to the bottom to do Chamber Beetles. If you are soloing, grab multiple stacks of sleep bolts and chain sleep one over and over again for skillups. This is probably where you'll want to start to use Archers knives and RangeAccuracy rings if you havent been using them .
An alternate spot would be Quicksand Caves. You can old worm type mobs in there. I'd recommend doing the same sleep bolt routine to keep you alive and prevent Stonega II. If they do land a Stonega II, use bloody bolts to drain the health right back from them.
-Level Range- 50-75 for both areas
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[140-190] - Head to Kuftal and do Robber Crabs. Depending on your evasion level and equipment you may want to do these in a small group. If you are close to level 70,and wear good evasion gear you will be able to solo these easily. An "E" rated weaponskill such as Club or H2H will stop giving you skillups at around the 180 range before requiring you to move up.
-Level Range- 70-75
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[190-230] - At 70+ I went to boyoda tree and did Steelshells for skillups. Steelshells will level every single skill on a THF to it's cap all the way up to 75. You should be able to tank them at 70+, but I would hold off on soloing them until around 73. At level 74 your evasion will be high enough that you can tank many of these with just one Utsusemi spell.
-Level Range- 74-75 For solo , and 70-74 for skill up partys since you will probably be the one pulling and the Steelshells would con IT around 60-67, and you would probably miss most of the time.
This is the end of my guide to lcling Thief marksmanship,I hope this Guide is good enough for me to get premium access
*edit post* Added the lvl ranges 7/15/05