Q. How do I restore a large garden shears that has totally rusted shut?

[dpibel]

2. A hammer, most likely

Lay it with the blades flat on a hard surface.

Give a few smart raps with a hammer on the top blade.

Likely will break it loose.

Don't be shy about whacking it. You've got a broken tool. If you break it more, no loss, really.

But probably it will break the rust and then you can polish it up and oil it and go forth and shear.