By Ifrit.Itazura 2010-05-11 16:53:57
Combat skills or magic skills?
Besieged is great for magic skills like Elemental, Dark, Enfeebling, and Singing/String/Wind. Also, if you have Al'Taieu access, you can spam non-damage offensive magic (Slow, Paralyze, Sleep, Repose, Lullaby, Threnody, etc.) at the 'hpemdes without fear.
Non-offensive magics are a bit harder; there's really not much to do except to spam bar- spells over and over for Enhancing Magic, for example. Healing Magic caps sooner or later for PLD or healer jobs, though, so at least that's nothing to worry about. (I feel sorry for SMNs, however.)
Field of Valor is probably the best way to solo for combat skill ups; you can usually find at least something EP that's manageable. Can't cap skills this way, but at least can bring them up to usable levels.
Then, there's always the option of asking LS mates to join you for a skill up/weapon latent unlock party.