If you induce SP yourself you probably will not get the feelings of fear that a lot of people talk about. Most of the time people have issues is when they have HH (Hypnagogic Hallucinations). Their mind attempts to figure out why they can’t move, often resulting in frightening images.
When you intentionally induce SP (a very important step in the WILD technique), you probably will not have the same issues. You will still have HH, but that is how you go from SP to LD. You will always have to deal with the fact that you cannot move; however, if you realize that this is just a natural part of your sleep cycle and stay calm, you will not have to deal with those feelings of dread or terrifying images.
You might want to check out these threads:
The WILD FAQ
The BIG sleep paralysis and old hag topic
Anywho, I hope that helps. Good luck!