A method for inserting at least a portion of a dilator and sheath assembly into a patient and for removing the dilator from the patient is disclosed. Initially, the dilator and sheath assembly is received. The dilator includes a radially enlarged dilator bump. At least the distal ends of the dilator and the sheath are inserted in an incision in the patient. A vector force is exerted to the dilator and sheath assembly to push the dilator and sheath assembly further within the patient. The dilator hub is decoupled from the sheath hub. The dilator is removed from the patient through the sheath, where the dilator bump radially stretches at least the circumferentially continuous sheath distal end during removal of the dilator from the patient.