Intent, confidence, and repetition are key to manipulating your dream state. Keep repeating to yourself what you want to accomplish, and really believe that it will work. It may not always be instantaneous, but you'll eventually get the results your

Here's another way you might go about it: if a spider shows up, repeat the intent that you'll no longer feel fear/disgust in the presence of it. Much like one could bend reality in dreams, a dreamer's emotions, mindset, and expectations are similarly malleable.