Head to Secunda’s Kiss and find a decent sized rock which you are able to clearly run around while still having LOS over it.
Pull a Giant and kite it over to the rock you just found, then begin running circles around it. Use a magic ability to dump all of your Magicka and then transfer to a bow while you’re waiting for it to recharge.
Keep repeating this process and make sure that that you pause and drink some potions the second you take any damage. It may take a while to finish the giant off depending on your level but if you execute this strategy correctly you should be at no risk of dying.