My rule of thumb with for 1st time henna users: Keep It Simple
- just use water and henna, see how your hair takes to it. then add extras the next go around - oils, condish, other herbs, etc.
- rinse, rinse, rinse and rinse some more....
- be sure to use a moisturizing DC afterwards
ITA with JLove on keeping the whole process as simple as possible, then you can start adding other conditioning powders slowly into it, for example, you may start to add a tablespoon of amla powder, then shikakai, etc.
You may also later add a couple ounces of cheapie conditioner to your henna and make a henna gloss, I like Tresemme remoisture conditioner with B5 for this. Then later add some oils like coconut or bhringraj or amla oil etc, to it.
I would really stay away from adding acids to your henna, like lemon juice, ACV, too much amla powder, etc, (if you have dry hair) as they are very drying when added to henna for use on African American hair. Our hair simply cannot handle the acids as well as oily haired folks. The acids are only needed to help the henna color release faster but if you mix the henna overnight for about 10 - 12 hours, this is just as effective as putting acids in your henna which enables you to apply it to your hair in half the time. Even Kadija, owner of Henna Sooq admits that she does not use lemon juice in her henna mixes because of the dryness.
I always mix my henna the night before I henna my hair and I henna now every 3-4 weeks. I did use indigo after my last henna and you can actually see the difference in coloring in my siggy pics
. Hope this helps a little.
ETA: As PrettyFace indicated, do not wash out your henna with shampoo. Use some cheapie conditioner for washing, then deep condition your hair as normal with a moisturizing deep conditioner. You will have to rinse it at least a good 15 minutes and co-wash it for 8-10 times perhaps as well before most to all of it comes out.
Take your time when rinsing it out. Do not tug and pull at your hair, just allow the water from your shower to loosen it up a little first, be as gentle as you can with your hair at this point and when most of the henna is out then start moving it a little to allow the water to wash it out further.