The installation of Your Propeller:  A propeller must be installed by an A&P mechanic.  Often the proper installation bolt torque is shown on the blade decal near the hub. Always have the blade track checked after the hub bolts are tightened.  (Blade track is the ability of one blade to follow the other in the same plane of rotation.)  If the propeller-engine combination feels rough in flight, ask your mechanic to remove the propeller, rotate it 180 degrees on the engine crankshaft flange, and re-install.  Again check blade track.  This provides a means to verify that the crankshaft flange is true. 

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