HomeAdvisor’s Gutter Cost Guide lists pricesociated with installing or replacing gutters and downspouts including labor and materials, as reported by HomeAdvisor customers..Gutter replacement, which involves installing your own rain gutters can save you substantially over professionally installed gutters, but there are a few pitfalls to watch out for. Inspect the fascia and soffit Fig. B for signs of rotted wood, which will need to be replaced before you put up the rain gutters… Slip a gutter mountingcket into the high end of the gutter, then drive a through thecket and fascia and into a rafter. . Adjust the pitch of the gutter so that rainwater will drain down to where the downspout will be installed. . Slipckets into the gutter and drive thes through theckets and into the rafters..We asked experts in gutter repair and gutter replacement for the average cost of repairing or replacing gutters. See their answers, plus tips on gutter guards..