I've got some nice Dragonplate armour now and I was thinking about enchanting it with something nice. My enchantment skill is not maxed out though, so I will only be able to put some mediocre enchantments on the armour.
Can I put some weaker enchantment on it now and later, when I have better enchantment skill, replace the enchantment with something new? Or can I only enchant plain, non-magical items? Is there a way to unenchant an item?