Product review (4 stars): installed it myself. I not a contractor but if ...
installed it myself.  I not a contractor but if you have a medium amount of "handyness" you can do it.  Used common sense more than the instructions.  Just take your time with lining up the screw holes, pre mark the holes while having someone hold the vent in place, then you can put the screws in 75% and hang the fan from those, before tightening down the rest of the way.  I installed as a recirculator for now, i may vent it to the outside at another time.