Dr. Craik is a unique figure. To play the role, one must understand not only the doctor's background, but also those of the people he encountered. Dr. Craik must know George Washington's experiences in the French and Indian War, Washington's rise in military rank, his ability to lead, and the events in the interim of the wars, as well as the events of Washington's courtship of the widow Martha Custis, and of course 18th century medical practices.
The task of interpretation involves scholarship, rehearsal, improv without making stuff up, and recall.
I have two videos to share below, but beware: some of the following content can be graphic in nature.
Removing a Bullet
Amputating an Arm