I hope your order gets there soon....that must be incredibly frustrating
Anyway, to answer your questions:
-I use the BB line and Herbal Essence Body Envy gel in between treatments
-I deep condition (leave-in BB Curl Quenching, apply plastic cap and sit under bonnet dryer for 20 minutes or so). OH, and I don't use shampoo to rinse it out...just a LOT of cheapie conditioner
-I condition my hair before the treatment w/ a cheapie conditioner (that contains very few, if any oils). I detangle in sections, rinse, wring and then apply cassia/henna. This makes for easy application and easy rinsing.
-I've left it in from 1hr-6hrs. I don't think it matters...you're not waiting for color, but i figure that it can't hurt to leave it on longer. If you use heat, you can definitely leave it on for a shorter period of time.
I'm still waiting inpatiently for my henna to arrive!!!!! If it gets here this week, I'll do it Friday or Saturday