I did HC a few days ago. the first pitch was nails! But one of the best pitches of my life. The upper pitches are fairly exposed and quite technical. HC is (IMO) much harder than BBB, both endurance wise, and technically. I'm a comfortable 24 climber, and the first pitch was HARD (to onsight anyway.... fell off at first roof) and the rest of the climb is rather sustained and long. The traverse would be terrifying if it was hard for you.The seconder needs to carry a bag full of water and shoes too. Get on the West face of the MIrrorball and do the 21 top pitch before you try HC