If you are using it as a DC you can go ahead a heat it up. You can also do the baggy method and just place regular temp. EVOO on and put a bag or shower cap over it and leave it on all day (put a scarf on if your going out). For me thats the best way to get a good dc w/ my 4a hair but you just have to experiment with it. I don't really measure the amount but if I did it would probably be 1 teaspoon of EVOO. Too much and your hair will become oily and its a pain to get out.