Never owned a torque wrench for the first 15 years of my biking life. Never stripped a bike right down during that time, but did plenty of spanner work. One day on my first 500/4 in 1975 I stripped the thread holding the cam cover. Taught me a lesson. Not to use a torque wrench, but to know when a thread was in trouble. Reserve the torque wrench for important or structural bolts (including the thread title), not for fitting your fender stays and the like.