It s much easier to join sections on the ground than to work from the top of a ladder.
Installing gutter pop.
Snap the sections together.
Cut a two inch long notch in the front lip of the gutter with tin snips to join a rain gutter section.
How to install a rain gutter ask this old house duration.
Step 3 optional catch basin.
To control the flow of water away from a roof gutter downspout installing a 9 to 12 inch catch basin is recommended.
Dig a trench large enough to hold the catch basin.