You would require the necessary perks in enchanting, alchemy, and smithing.
First, enchant armor/boots/gloves (or whatever can be enchanted) with alchemy boosting properties. Now, equipping that gear, create a potion that enhances your enchanting skill for a certain amount of time. Now go back, drink the potion, and enchant new equipment with alchemy boosting properties again.
Your new equipment with now boost your alchemy even more, which will allow you to create a potion that enhances your enchanting even more than the first potion you made. Rinse and repeat until you've whet your appetite of game-breaking goodness and finally create smith boosting equipment and a smith boosting potion. Go to the blacksmith and create your gear while you have your smith boosting equipment/potion and upgrade it to -truly- legendary stats. Ta-da.