When trimming the aluminum skin of the freezer, you need to prepare the following tools: electric drill, hand electric drill, drill bit, saw blade, aluminum glue, fine sandpaper, metal file, etc.

1. Preparation: First, polish the scratches on the aluminum skin with fine sandpaper to remove the rusty parts.

2. Scribing: Mark the shape and size to be trimmed on the aluminum skin with a pencil.

3. Sawing: Install a suitable drill bit with a hand electric drill or electric drill, and drill holes in the marked area. Then use a saw blade to cut along the scribe line bit by bit until the desired shape and size are reached.

4. Shaping: Use a metal file to smooth and shape the cutting edge.

5. Polishing: Polishing the trimmed aluminum skin with fine sandpaper to make it better combined with the original aluminum skin surface.

6. Sticking: Apply appropriate aluminum glue to the parts to be trimmed and the trimmed aluminum skin, and press it tightly until the drying time is over.

7. Painting: If further beautification is needed, you can choose to spray special antirust paint or other paints on the trimmed surface to protect and beautify the surface.

The above are the steps to trim the aluminum skin of the freezer, and you can refer to it if necessary.