But enchanting uses SOUL GEMS, not pretty rocks. As a thief character I demand you leave your pretty stuff unscathed for me.
Yes soul trapping consist of finding and killing a dangerous monster and trap it soul, so to get a good gem you has to kill a high level monster. Hopefully they return to Morrowind’s system so you want a level 50 dragon’s soul for best effect.
Now you can enchant with any fitting spell you know, yes I want to have a dagger with heal on strike.