If preparing images for printing, resize to the correct print size first using the Crop Tool or Image Size command in Photoshop, making sure the resolution is set to 300 pixels per inch. Then apply sharpening – perhaps with Unsharp Mask – to the resized image.
When sharpening for print, always do so after resizing for a specific print size. The correct resolution for prints is 300 pixels per inch. So a 10-inch print should be 3,000 pixels wide. Typically prints need a stronger level of sharpening than images for web, as the printing process tends to soften them slightly. So in general, push the sharpening effect slightly further than you might think acceptable.