This would take 2 people with the right tools about 10 minutes.  It took me 1 hour...mainly because I don't have a 15/16" wrench and my adjustable pliers would barely fit.  Furthermore, my attmpt at hanging the upper arm from the rafters while tigtening the bolt 1/4" turn at a time was...uhh...nearly very dangerous.  I am glad I made the purchase, but in the future would love to have known that I needed allen keys, and a crescent wrench set and someone to hold the upper arm while I tightened the nut.  This thing is rock-solid, and makes resawing 12" quite the pleasure.