I didn't think it would work, but 5 minutes into it my whole body began to lock into place, I couldn't feel my hands or feet, they were like real hooves!!!
The only way for this to work is if you are COMPLETELY relaxed, it worked for me when I was lying on my back in bed, try it like that, I find it to work better. Heck it was crazy, I actually felt like I was inside Pinkie's body for a few seconds, never felt anything like it!