I bought this after my first carbon steerer tube cracked (maybe it was my fault, but the tube was really thin). Only used the torque wrench twice since then. When tightening the new carbon steerer, the "correct" torque wasn't enough because it still rotated. So, I put the torque wrench down, and did it by feel. The other time it got used was after a new seatpost install. Spec for the saddle rails was 8 N-m, and I decided to do it strictly by hand first. I tightened to what felt tight enough, then used the torque wrench to verify. There was the slightest bit of tightening with the wrench, but it was pretty much exactly where it was supposed to be.

Here's an idea: Go to a bike shop and offer to pay them to let you tighten a few things. (Or teach you.) They might even have some broken carbon steerer tubes or handlebars laying around that you could intentionally overtighten (and even break). Use their torque wrench and then use your hands only to duplicate it. You can learn by feel what is right.

Also, if you are unfamiliar with tightening by feel, what are you going to do if you need to do an adjustment out on the road ... and your torque wrench is miles away?