Just a tip. for the late game equipment enchantments, I'd recommend enchanting your boots with Resist Fire (possibly augmented by the Fire Enchanter perk) instead of Muffle. Since you're using enchanting to reduce Illusion spell costs to 0, you can dual cast a Muffle spell and it will last for a huge 396 seconds. Beyond that, once you get the Silence perk, Muffle enchantments are useless. This would also eliminate the need to find a Necklace of the Firewalker.
Just a tip. for the late game equipment enchantments, I'd recommend enchanting your boots with Resist Fire (possibly augmented by the Fire Enchanter perk) instead of Muffle. Since you're using enchanting to reduce Illusion spell costs to 0, you can dual cast a Muffle spell and it will last for a huge 396 seconds. Beyond that, once you get the Silence perk, Muffle enchantments are useless. This would also eliminate the need to find a Necklace of the Firewalker.