I think some of the issues that are commonly cited as constituting difficulty -- neediness, drama, resistance, reticence, frequent emailing -- can actually be to the therapist's advantage. These things either prolong therapy, providing them with ongoing income, or make them feel needed and important. Being triggered into childlike neediness, being so destabilized that you can't stop emailing or obsessing, or having an expensive session wasted because you are too uncomfortable to speak or be open... these are difficulties FOR THE CLIENT.