For those that have trouble keeping up the PMA(who doesn't at first)here is something that should help you:
Try to "interrupt" (stop) any "negative" thought you have. Replace it with a positive thought about yourself such as; I am pretty or I am smart. While you are doing that, think of a picture in your mind, that makes you smile and feel warm inside. Do this every time you start to worry, or get that pit in your stomach, or feel sad, powerless, or lost.
This will help you to detach and to keep up the PMA(positive mental attitude) which is critical to successful DBing