I had this project a few years ago. I went to the local home center and got a pamphlet that had all the parts and a breif description on how to install. After figuring all of the parts and priced them out I called a gutter installation company and got a quote on seamless gutters to be installed. The numbers were so close I chose the gutter company. No Labor, and if there was a problem I know I didn't do anything wrong.