How to fix a serpentine belt on an 86 buick lesabre?

I have the belt all fed through and found the tension wheel, but no matter what I do, I cannot get the thing to move. Do I need to remove the nut on the idle wheel? This is my first time fixing this part and if anyone has done this before or really knows how it would be nice to know what you did. Please no stupid answers and no B.S. I need real know how.How to fix a serpentine belt on an 86 buick lesabre?That's a heavy spring on the tension wheel. You'll probably need a long wrench to pull it back.How to fix a serpentine belt on an 86 buick lesabre?I feed the belt through the pulleys until I have the belt is ready to go under the tensioner. Then I hook a socket to the tension pulley and pull it over, it will flex over to the right most times. Then push the belt under the tensioner. Sometimes I like to have a second set of hands just in case the belt slips off somewhere. Easy enough!