First off, don’t get discouraged by early failures. WILD, while being a very popular tech, can be difficult for some beginners. The biggest thing with WILD is to simply let go of everything around you. If you begin to concentrate on how your body feels, you’ll lose it. The same is true if you begin to concentrate too hard on the images. You simply have to remain focused as all of these things are going on around you.
Now, other than that basics, there are a few things we need to know. First, are you doing this later on in the night or right when you go to bed? Next, How quickly (or long) does it take you to fall asleep. Last, how much time do you have to sleep every night?
These factors as well as others can effect the success you have with WILD. Now I’ll admit I have a much higher success rate with MILD and RCILD myself, so I’d like to defer you to an expert on the subject. Expert, take it away! crosses fingers the next poster is a WILD expert 
In all seriousness, there are some great topics you might want to look over here:
The WILD FAQ
WILD- A user friendly tutorial
The BIG WILD topic