The part that stood out to me is: > Doctors sought to monopolize the simple treatment by convincing the public that the procedure could only be done by a train

The part that stood out to me is: > Doctors sought to monopolize the simple treatment by convincing the public that the procedure could only be done by a trained professional. The procedure was now preceded by a severe bloodletting, in which the patient was bled, often to faintness, in order to 'purify' the blood and prevent fever. Doctors also began to favour deep incisions [versus superficial scratches], which also discouraged amateurs.