I had root canal done 33 years ago just had shots in gums. Don't remember any pain. Don't know if that is cuz of dissociation or what but the only discomfort I remember is having to wear the temp crown/tooth or what ever they call it until the permanant one was done and that was only cuz it would come out when I'd eat a sandwich and that was more irritating than anything else. Don't know your history but if you feel not safe maybe you can have someone stay with you till done.