Laying your gutter on the workbench measure off the amount of gutter you want to cut and mark it with a pencil.
Cut the gutter.
Work wrinkles and bubbles flat.
Cut the tape with a scissors or a razor knife photo 2.
Cut a two inch long notch in the front lip of the gutter with tin snips to join a rain gutter section with an inside or outside corner piece.
If the section of the gutter you are discarding is on your left use the right hand tin snips and vice versa if the discarded section is on right.
Switch to other side of the gutter and cut down the line until you reach the bottom again.
Proceed to cut down along the side of the aluminum gutter repeat the process to cut down along the other side of the aluminum gutter.
Cut a four inch long notch to overlap and splice together gutter sections.
Cut along the marked line you placed on the aluminum gutter starting at the flange turning inward toward the opening of the aluminum gutter.
Use the old adage measure twice and cut once then turn the gutter upside down on the table and mark it all the way around.
Cut along the pencil cut line with a pair of aviation snips.
Roll the tape down the wall of the gutter pushing it firmly into curves and corners photo 3.
Start cutting on an outer flange edge with the pattern shears.
If you have difficulty cutting with the tin snips make another cut 1 to 2 inches away from the cut line with the alternate hand snip.
Turn the gutter section over so that you can hold it by one side.
Cut until you reach the bottom of the gutter.