Burs and files are the most important pieces of equipment to carry out the endodontic procedures. Therefore keeping them disinfected and sterilizing them properly is the most important task to be done.
Sterilization is one of the most important things when it comes to killing germs. People mostly disinfect the instruments thinking it kills germs but the reality behind it is different. Disinfection only makes the germs harmless whereas sterilization kills the germs making instruments safe for further use. Autoclaves are used often to sterilize the instruments, read here
While operating on your patient it is necessary that you sit in a comfortable position that gives you the proper sight to carry out the procedure. Read about the possible comfortable positions while operating your patient here