Do you mean actually mixing three into one concoction or applying one after another? If it's the former, than I see no point of during that, there are aha products with moisturizing agents already included. If the latter, then go for it, just make sure to apply AHA first.

I have been using a lotion by mama nature that has jojoba oil and manuka in it. The results i have had have been amazing. I think the jojoba oil is mainly the beneficial ingredient but it also has a strong smell of tea tree. has anyone else had success with these ingredients?

It is perfectly fine to mix the Acne.org moisturizer, AHA, and jojoba oil if you want to and if that works well for your skin. Just mix them in your hand before you apply to your face.

do you mix it ?

or is it better to use layer per layer as step 3 and step 4 then jojoba oil as step 5?