I have been thinking of hennaing my hair for a long time and now i finally did it. I used:
100 grams of Ancient Sunrise henna from mehandi.com and a mildly acidic liquid mix
I mixed all the ingredients together and let it sit for about 20 hours. Then I got it into my hair, wrapped it and left it on for about 3 hours, then rinsed it out. Surprisingly, there was almost no mess and no stains anywhere. I am very happy with the result, my hair now looks healthier and falls out less.