I had a funny, great experience today making a scribble drawing with a 13 year old. We drew together using our non-dominant hand. Her comments were, "Oooo, this feels strange." "This hard to do." "This is really awkward." "Oh, I forgot we were using our other hand and I just did it the easy way." What struck me was, those comments are pretty darn universal to any kind of change. If it's hard to change something a simple as how you hold a crayon, it really puts perspective on how hard it is to change years of behavior.
(For anyone who may be concerned, this was not a client. Confidentiality was not breached in telling this story.)