[Ayrlie]

1. your weapon skill must be of that minimum skill level or higher. minimum weapon skill levels can range from 230 to 250 depending on weapon. weapon skills exclusive to an job tend to have a 250 skill requirement; weaponskills that mages use tend to have a 230 skill requirement.
2. only 1 ws quest can be active at an time. you can't get another quest until the one you are currently on is finished. you may deactivate a quest at anytime by talking to quest NPC, but it will reset the WS points.
3. you must be at least level 71 on a job that has a skill level with that weapon and can use the trial weapon. certain weapons are job-exclusive (Asuran Fists can only be flagged as Monk main job).
4. if you delevel to 70 while trying to do ws points, you must either regain level 71 or change to another level 71+ job that can use that weapon before finishing off the latents. if you delevel to 70 after the latent effects of trial weapon got worked off, you can still finish the quest and use the weaponskill.