Yes, you are correct about this. Dr. Richards advises to not check in with how you are currently feeling or the current state of your progress, because as we begin to internalize and analyze how we are doing, the ANTs usually step in and we become "paralyzed" by our negative thinking (hence the phrase, analysis = paralysis). The solution is to not worry about your progress or how you are doing, but instead to keep doing things to keep us from thinking too much and getting into ANTs territory; whether it's exercising or anything active, relaxing, using the cognitive strategies from the therapy, talking to a positive friend, etc. Doing these things will help get your mind off the anxiety and negative thinking and in a better state of mind, and will actually allow you to make progress faster than you would if you keep evaluating and analyzing your thoughts and behavior.
So just keep moving forward gently and let this overthinking and over-analyzing stuff go and you will keep making progress :).