Cut along the pencil cut line with a pair of aviation snips.
Cut the gutter.
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 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.
Start cutting on an outer flange edge with the pattern shears.
Use a carpenter s square to get around to the bottom.
Work wrinkles and bubbles flat.
Cut a four inch long notch to overlap and splice together gutter sections.
Roll the tape down the wall of the gutter pushing it firmly into curves and corners photo 3.
Turn the gutter section over so that you can hold it by one side.
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.
Tear the paper backing off the tape and lightly adhere one edge of the tape to the top of the gutter.
Cut until you reach the bottom of the gutter.
Switch to other side of the gutter and cut down the line until you reach the bottom again.
Work slowly so that you can maintain a straight cut and limit the crinkling of metal.
Laying your gutter on the workbench measure off the amount of gutter you want to cut and mark it with a pencil.
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.