When you take action, you need to act without interference from your thinking mind. If you allow your mind to think, it will find devious ways to seek comfort. It will question your plan, or your ability to do the moves. This is a manifestation of your mind seeking escape instead of dealing with the stress.
Many of my students insist at first that you need to think in order to climb. This misconception probably stems from their habitual mixing of thinking and doing skill sets. Consider a skill you already do without thinking: driving a car or riding a bicycle. You can do these skills without consciously thinking. When you go around a curve, you don’t need to think about how much to turn the car’s steering wheel or lean the bicycle. Your mind is simply observant, taking in the information and allowing your body to respond appropriately.
Climbing is no different. Your body knows how to move and you need to trust its knowledge. Your body wants to be in balance. You don’t stand in an unbalance position, nor do you walk in an unbalanced way. Balance is something your body is attentive to without your thinking mind having to direct it. Paying attention to how your body directs you while climbing will create efficient movement.
Your mind, however, will interfere with this process by looking for comfortable short-term solutions. For example, it will look for holds to grab instead of footholds to stand on. Your mind feels more comfortable and in control when grabbing with hands than when trusting feet. Notice this interference and shift attention back to trusting your body.