A major obstacle to developing good human relations skills is that people fear of taking risks.
No, there are no suffixes in the word pedal.
Yes, because if you want to be successful you need to be competitive in order to achieve it. Being competitive means having motivation to keep going if you fail at something because you want to be in the first place, and to be able to do that you need to get better and not give up because you failed once.
On Plato, "Biting my traunt pen, beating myself for spite--" would be correct. But I'm not sure about the other line. It could be "Thus, great with child to speak, and hopeless in my throes," Here is a photo to help. :)