Are you sure they really need transplanting: These plants often grow in colonies, especially those that produce offsets, like aliciae. If you wish to divide them, take the root ball out of the pot like Tristan says. With your fingers close to the base of the 2 rosettes, gently begin to separate the ball, by pulling with a gentle wiggeling motion in opposite directions. Alternatively, the mix can be sloshed away from the rosettes in a bucket of rainwater until the roots are exposed. Untangle the roots by either method, and repot into new containers. Most Drosera will transplant without trouble by just gently pullng them apart, being careful not to break the roots although they will stand up to a little damage. Put the pots in a plastic bag for a week or so, keep warm and in good light, and remove from the bag when dew appears. Which species are you dividing?