If anything i believe each class has the ability to complete the climb solo. Go with classes you're comfortable with. POTD is a great way to learn and get practice on classes you're not familiar with as well. Spend some time to get some potshards to trade in for regen potions they go a long way. If you guys need to look at a video of the next set of floors to make a game plan do that. There may be fails but you guys will get through it!