What are you talking about? Plenty of us did it without guides. You have unlimited attempts so it's merely trial and error.
Oh, this epic box I chose gave me a skip to one of the portals? Maybe there's a skip for every one of them.
Oh, these easy to kill rares drop multiple hourglasses? Definitely worth killing for a chance at a drake or box.
Oh, I found a chest that gave me 1-3 hourglasses... I wonder if each shrine has one.
It's incredibly straightforward. Using a guide would probably mean saving an hour or two tops.
- - - Updated - - -
I don't think it can in terms of boss difficulty. It's not tailored for each class individually, it's tailored for all of them. Take Warlock and Mage. Mage doesn't stand a chance against a Warlock when it comes to solo'ing "ease", so if they make it hard for Warlocks, it'd be a nightmare or even impossible for Mages.