I do one about every 2 weeks or so (well that's what i aim for - doesn't always happen). I shampoo my hair before, but I shampoo regularly anyway, I just do this with my head under the shower head. Put the dt into wet hair, wrap it in cling film, then a towel and leave it for about 1/2 an hour or so. Then I get into the shower, rinse it off and put in styling products, I don't condition again.