Newbie, don't worry, this is a common thought. It is however not a valid one.If you have been selected above others for your role then you need to have the self confidence to believe you can perform to the required level. If you continue to doubt yourself your lack of confidence will come across to your colleagues. They will automatically assume you to be incompetent regardless of your actual quality.Chances are you'll be fine, you actually have to be quite weak (and bad at hiding it) to get managed out. Good luck.