my uncle and my sister in law both do root canals, though my SIL its her specialty - endontist.
I've had a few - no issues at all. i was scared the first time i needed one cause my mom's experiences were seemingly awful. Mine were uneventful.
If a tooth is killing me, advil for a few days will dull the pain enough till i could get to the dentist. besides - if the tooth is hurting that bad, and its not infected, you know what's happening? the nerve is dying. It doesn't take that long for it to be killed completely. Then the root canal could theoretically be done without novicaine. yes, seriously. my uncle always test the tooth first without novicaine or he could kill a live root.