On the bottom of the gutter itself take a pencil or marker and trace the outline of a sleeve.
Cut hole in gutter for downpipe.
Step 2 drill four holes in each corner of the outline you made of the sleeve drill one hole.
Step 1 is to draw the shape of the hole and drill s few holes around that shape.
Here you can see the shape of the downspout flange i had.
This one came with holes in it for rivets.
Center the connector around the hole and trace the outside of the connector with the pencil.
This is the thing that connects the gutter and downspout together so it is important that it is placed correctly and securely.
Drill a hole in the bottom of the gutter at the 4 inch mark with a 1 inch hole saw attachment to the drill.
Step 3 cut the tracing for the connector with a pair of sheet metal cutters.