Thing is, the OP never mentioned that it was leaking at the join(s) - given that it's typically leaking at the join, but it could be that it's a split length.
No need for a householder to use power tools up a ladder. The bolt/nut can usually be mini-hack sawed off. Tie the ladder in, and have someone foot the ladder.
The householder has time to break the join, clean it out, and apply a lick of gloss to both "sides" of the join. Allow to go tacky, and then lay a bed of putty in it. Bolt up with new bolts and nuts.
Working on CI guttering can be hazardous for a DIY'er - unexpectedly heavy lengths of guttering, rotten lengths collapsing, and perhaps ladder stand-offs required. Or even two workers up two ladders.