if your uncomfortable, move. the whole point is to get right on the verge of sleep without actually falling asleep. that's when your body will paralyze. I would work more on faling asleep, but keeping your attention on something else. maybe have a quiet beep in the background, or a fan going, or your breathing. counting can work. just keep your mind occupied during the whole process. set an alarm for 30 min in case you fail then try again.