Reading a book on psychology I came across a phrase I don't really understand. Here it is: 'It is often much more of a challenge to deal with someone who does not acknowledge that there is a problem at all, than with someone who is struggling only with their own capacity to change in a certain area.' The whole meaning is clear -- two groups of people are compared: people who can't see any problem in their life and people who 'struggle with their capacity to change'. What is the problem with the second group? What does 'struggle with one's capacity to do smth' mean?