Oh… you’ll know. If you begin to enjoy a euphoric sensation. If your anxiety dissipates and you feel more connected to the world around you and more aware of your space within it, yeah, you’re riding the wave.
But it won’t be dramatic. The effects of microdosing are subtle. Sometimes, you may not even notice until after the fact when you look back on it. You might find that you were more aware, a bit more creative, and a heightened emotional state. But no, you won’t be tripping.