I managed to erect the arch on my own but then I am 76 years of age and a female!!! Obviously  took me longer than a more agile person.  
Has only been up for a couple of days so time will tell with regard to weather resistance.  There are 12 steel pegs to help secure the arch in place.   So far more than happy particularly with the reduction in price.  Also it was the required width.  All others were way too wide.