Obtain the Sigil Stone from an Oblivion Gate
Reach the Arcane University or use a Frostcrag Spire altar
Get a filled soul gem
Acquire a weapon to enchant
Learn an enchantment effect by using a spell or item with that effect
Activate the enchanting altar
Select the weapon
Select the enchantment effect
Choose the soul gem
Set the enchantment strength if available
Confirm the enchantment
Use the weapon’s charges until the soul gem’s power is depleted
Recharge the weapon with filled soul gems or by waiting if applicable