The biggest mistake you can do is undercut your own ability, straight from its source. You are your number one fan. You are the one person who should always one hundred percent believe in you most. If you can achieve that level of self-belief, self-confidence, self-attunement, then you will pass like a breeze through obstacles, ready to dust yourself off and try again; because the only limitations that have ever mattered or will ever matter are your own - and if you impose none on yourself, the universe is infinite.