If Pete believes that he can't do this or that he won't be any good at this, then his thoughts on the subject will be self fulfilling prophecies. If he believes he will be horrible at networking, then he won't let his belief system down. He'll be horrible. If he believes that he will be a dynamo, again his belief system will kick in and he will be a dynamo. Thoughts are things and beliefs are thoughts that we are committed to.
Lets get out of the box for a moment here and turn that phrase around.
I'll see it when I believe it . What do you think about yourself and about your capabilities. Maybe your belief structure supports the idea that your success is mainly governed by hard work and circumstance. If so, you may have to step out of the box here, and just trust me. Thoughts are things, and your life, to date, is the culmination of every thought about yourself that you have ever subscribed to.