There isn't really any reason you'd need to reset skill points other than wanting to cheat. They give you more than enough points to max out almost all the jobs, if you level up all classes to 99. On top of that, your class can be reset back to 1 once you hit 99 with any class and you can do it 10 times per class.
The amount of total points need to max out all skills is 2600, you can get 2400 for all classes hitting 99 (200 per class), with 200 per class and revocation you can get 2000 for just a single class reaching max revocation. Essentially, this game makes it so that there's no right or wrong way to make your character. You can however optimize your character by focusing on jobs that you want and putting points into skills that are cross-class i.e. swords for ministrel/warrior/thief.
If you really need points because you screwed up, you can always switch to another class that you know you won't use i.e. if you plan on being a warrior but not a mage, and farm the points from that class to use on the warrior build instead.