You are your own worst enemy. Too often you tackle a task with the thought, "I'll never finish this" OR "I can't do that". Never say "I can't before you even try. In fact, remove I Can't from your vocabulary totally. If you think about the technology that exists today and compare it to that of only 50 years ago, you know that I Can't is an invalid term. It ONLY becomes true if you believe it to be so!
One key to success is, before attempting any task, proclaim loudly and proudly....