Any panel replacement in an area like the roof gutter where two panels meet will be difficult, especially if you have not tackled anything like this before.
If it is just surface rust you may be able to clean up the area using a wire brush attachment on a drill or angle grinder. Then treat with a rust neutraliser like K-Rust followed by a coat of zinc primer.
Depending on the finish you require, spray on or paint on the top coat of cellulose. Some independent motor factors will mix up as little as half a litre of celly while you wait.
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