Before you do any WILD technique it is important that you relax your body. I posted a good progressive relaxation technique in the meditationthread. You can record that routine to tape so you don’t have to think too much about what you are doing. However, if you do find that you become tense again simply tighten then relax that muscle. Keep doing that until it feels relaxed. Also you can imagine a ray of sunlight shining down on the muscle. Feel the sunlight soothing and relaxing the muscle.
As for visualization:
if you can not visualize an object simply focus your attention in the center of your fore head between your eyebrows. Try to imagine a white dot there but if you can not see it don’t worry about it. Keep your attention there anyway.