The dreaded mistake... I made a new staff and improved it with all the materials I had. Then I put a glyph of frost instead of shock. I can't believe I messed it up. It was beautiful.
I change out enchantments all the time. In fact, with base White Enchantments, like during leveling, I just replace the existing enchantment with a looted one rather than use a Soul Gem to charge it.
Enjoy the game, life is what you really want to be worried about.
PakKat "Everything was going well, until I died"
Gary Gravestink "I am glad you died, I needed the help"