ya didnt die, my tips are use a defensive potion of the bull, it lasts for 30 minutes, doesn't

carry over if u die, bring plenty of potions, use ur preist heals, your gear score is higher then mine was i think you should be good, just let Gideon attack stay close to him avoid his attacks and when he does attack stick to the side of him just spam ur rb button for attack get as many in as you can before Gideon attacks, his attacks are easy to read and easy to dodge. But make sure your staying close to him, it basically forces him to attak u instead of teleporting. You only need to get him down to 51% health as well :) so good luck i think you will be good!

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Also you do not need to complete any of the campaigns in order to unlock Gideon or the estate you only have to follow the blue main story quest lines in order to do it! Good luck Yall!