Obviously go during the day, frost resist a must , if you take the time to brew them up then you have a good chance the spawn will reset back to original positions.

Then you need to make the choice between best gear you can pull out of storage / craft run , and a naked run , both have their strengths and weaknesses.

If you do a geared run you have to meticulously clear on your approach, If you do a naked you need to run and pray. Either way you gotta run with anything you grab further down the mountain.

*edit , obviously only take one potion.

*edit 2 , maybe try to get a portal close.