Depending on the strength of the tabs, 1-2 probably won't cause you to trip super hard... if they're good tabs, you might trip about as hard as on 2-3g dried p. cubensis. In micrograms, 50-300 or so is usually referred to as psycholytic (distortion effects, change in perspective, some interesting head trippiness, but none of the crazy "I thought I was God" experiences), whereas 400+ will get you into the really intense/fun territory. Of course, I have a very high baseline tolerance for most things (yes, it sucks), so YMMV.