First, position one end of your chalk string about an inch below the top of the fascia board located on the lower edge of the roof of your shed. Also, choose a side to start with if the roof falls in two or more directions. Then move the other end of the roof and position the other end of the chalk string half inch lower for every 10 feet shed length. After that, pull back on the chalk string and let it go to make an appropriately sloped chalk line for the top of your gutter to follow.

With the use of hacksaw, cut a piece of a gutter material equivalent to the length of the side of the garden sheds. Put end caps over the ends of the gutter and crimp them in place with a crimper. Some gutter models may have end caps that you screw into place utilizing sheet metal screws. Then put the gutter upside down in front of you. After that, put a downspout connector on the bottom of the gutter, a few inches from the end that will be at the lower side of the line you created on the fascia board. Then trace the outline of the downspout connector with the use of a pencil or a pen.

Somewhere inside the outline you just drew, drill a hole in it. Take the tin snips and then cut along the outline with the use of the drilled hole to start. The next thing to proceed with is the turning of the gutter over. Put a line of a silicon sealant under the lip of the downspout connector then press the connector into the opening of the gutter.