how to make reetha powder

I am trying to figure out how to make reetha powder because I keep hearing about its benefits, but honestly, I'm a bit lost on the process. A friend of mine mentioned it when I said I was looking for natural ways to maintain my hair. I’ve read that reetha can be great for hair cleansing and it's all natural, which I love! But I’ve got these dried reetha pods sitting on my kitchen counter, and I’m just not quite sure how to transform them into powder. Do I need to do anything special before grinding? Like, should I soak them or simmer in water first or something? I don't want to mess it up! I have a blender but also wondered if a mortar and pestle would work better. I've seen videos online, but some say you can do it without boiling, and others insist that you must! Super confusing! What’s the actual best way to make reetha powder without compromising its properties? I even thought about just buying some ready-made powder, but what's the fun in that? Plus, I kinda want to make sure it's pure and nothing added. If anyone here has tips or a step-by-step on how to make reetha powder, I’d really appreciate it. Thanks for any help!