How about taking one, waiting an hour, and if your vibing take another one? I always eat one hit first, once I get that nice warm feeling and I can't stop smiling I know I'm in my groove and I can literally eat hits until I'm not a human being anymore. Good doses kick in rather quickly(i can feel strong doses in less then a half hour) and taking the two an hour apart for a first timer will still get the job done.
Now, if you actually have real LSD I'm jealous as I've given up on even trying to find it : /