The objective of a torque setting is to attain a specified preload on the bolt. Actually measuring it is problematic. If the axle or threads are lubricated, getting to the preload setting is eaisier than with no lubrication. In other words, 30-35 lb-ft would over torque a lubricated asssembly than a dry one. Why? Friction, or the lack of it is part of the total equation. Torque settings typically are stated for dry assemblies unles otherwise stated or instructed. Some estimate that if the assembly is lubricated, reduce the torque value between 20 and 50%. Unfortunatly I have not a clue what the right adjustment is for any given assembly.

WRT using a torque wrench. Unless I am torqing the same bolt every day in the same application, I don't trust my judgement. Why take the risk, just to save a little time? Torque wrenches are very reasonably priced and proved peace of mind.