Hi,
Generally people do not prep the area before tweezing. After cleansing, the pores in the area to be tweezed must be expanded/opened. To do this, try using a facial steamer or hot compresses. You can even go in your bathroom and turn on the hot water in your shower. When it gets good and steamy in the bathroom, stand in there for a few moments. After a few minutes, you should be ready to tweeze. When tweezing the hair, be sure to pull in the direction of the hair growth.