By "difficulty" I mean the need to utilize different (and quite untested) tools than have been used in the past.  Here are parts I, II, and III.

Until I explored this topic of how the Fed will increase rates I had only read about this concern from Dr. North, and even then I did not understand the whats or whys.  This is not to say that there was not more out there, just that I hadn't seen it.

While I watch or read almost nothing of the mainstream business news, even here I have not seen any mention of this issue – only bated breath while waiting for the omnipotent Fed to speak.  I have seen more discussion on this recently, and more that adds to my understanding; therefore I have decided to revisit this topic.

Tyler Durden asks: what's the big deal about a 0.25% rate increase?  He sets the stage by pointing directly to the interest on excess reserves (IOER) (emphasis in original):

…the Reverse Repo-IOER corridor is the most important component of the Fed's rate hike strategy, one which better work or otherwise the Fed will be helpless to raise rates with some $3 trillion in excess liquidity sloshing around, and what little credibility it has will be gone for good.