First you need to get to Mournhold and then find the robed lady in the Imperial Cult Services. Now go to spellmaking and select fortify skill and then any skill you want and set it at 100-100 on target. Now select soultrap for 2 seconds on self. Now buy the spell and cast it towards a wall. Do not upgrade your athletics or acrobatics because if you do the next time you jump you will never come down.