Certain skills like weapon mastery and lock pick will only appear on some drop items by particular npc. You usually find those items in white names which 2 or more enchantment slots. But you will never find them in normal locked chest loot and merchants goods.
I get bangle with +1 stun arrow around level 2, and bought a +1 wisdom ring around lvl 2 or 3 as well. Those are common skills which can be found through accessories. Currently I had wisdom at 2+6, and mindread 1+3, where just need swapping when mindread is needed.
