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Attach a support clip high up on the fascia board, at the opposite end from where the running outlet will be. You will probably find it easier to tighten screws near the roof covering with a hand-held screwdriver rather than a power drill-driver (image 1). Position a clip at the other end of the eaves, lower than the first and at the correct height to give the necessary pitch (image 2). Tie a string line between the two clips to form a guide line (image 3). Make sure the string line is taut and is not caught anywhere, especially if it has to travel around a corner (image 4). Check the pitch with a level (image 5). If it is not as you want it, adjust it by slightly repositioning the lower bracket.
Attach a third clip three feet away from the first one, with the string line just touching the top edge of the bracket (image 1). Attach a union bracket three feet along from the third clip. Then attach alternate clips and brackets until within three feet of the end (image 2). Remove the string line. Then clip the running outlet into the last, lowest support clip (image 3).
Position the first whole length of gutter by snapping one end of it into the highest clip (image 1). Snap a stop end onto the gutter before moving the ladder to clip the rest of the length in place (image 2). Snap the gutter into the next clip, and then insert its end into the first union bracket (image 3). Snap the next length into the union bracket. Continue installing whole lengths until near the end (image 4).
Mark where you need to cut the last piece of gutter to length. Use an off-cut of gutter to guide you for a straight cut with a panel saw (image 1). File the cut end of the gutter to remove burs (image 2). Position the last piece of gutter and clip it into the running outlet (image 3). Clip a stop end onto the running outlet if it needs one. If the roof overhangs the edge of the house by a long way, you may need to attach a short length of gutter the other side of the outlet, angled down from the eaves into the running outlet.