I have a single knob Moen shower faucet. It seems to installed in the correct manner, cold on the right side, hot on the left. When I turn it on hot water comes on first when turned to the cold water side. Does this mean I will need a professional to correct this or is there a simple solution to the problem?

Is this a new instalation or has it always been this way. You can rotate a Moen cartrdige to cause it to be reversed. Do you have a model, or I can give you generic info and tutorials. Installation Help / Animated Tutorial - Installing the Moen 1225 / 1200 Cartridge (http://www.moen.com/consumersupport/installation/moen0133/moen0133.cfm) Follow the step as though you were replacing an old cartridge but don't remove it just rotate it 180 degrees,reassemble and you should be good to go.

I have a single knob Moen shower faucet. It seems to installed in the correct manner, cold on the right side, hot on the left. When I turn it on hot water comes on first when turned to the cold water side. Does this mean I will need a professional to correct this or is there a simple solution to the problem?

Simple repair! Remove the knob and rotate the stem of the cartridge 180 degrees. Reinstall the knob and the problem's solved. Cheers, tom