Everything is controlled by mindpower...
If you think you will freak out [U]you will freak out.
But if you think it will be cool and you remain calm, you should do all right.
The first time just try one hit, and see what happens. It is definitely a weird high. When I've done it in the past, I tended to just kinda sit and zone off. It gave me a weird visual like life was like an old black and white movie reel. It was rolling down screen by screen. It was crazy. But it only lasted like 10 minutes, and it was cool.
Like I said remain calm and reality will return eventually.