5 to 8 grams of good Mimosa root per dose is more than enough imo. You take 10 grams or more and it'll probably be too much, but that depends on the quality of the root and how well you brew it.
I just take a dose of powder, put it in a jar, fill the jar up half way with room temp bottled water (like 300 to 400mls), put the lid on and shake it pretty well periodically throughout the day and let it sit overnight. The next day i filter the liquid through a coffee filter, and let it evaporate down to a residue which i scrape up and encapsulate, works like a charm, no boiling necessary and makes a potent residue. But you can probably use this for a tea instead of a residue.