Did weekly microdosing back in the day when I was still an office employee :) It took few trials before I found correct dose. You cant overdo it, becaue your focus will fly away. I meassured it in water and small shot glass. 100 mcgs in, 8 doses out. So around 13 mcg per microdose. Downside it you cannot macrodose at the same time, cos tolerance.
Use destiled water to avoid unwanted degradation. Keep in fridge.