Try using a layer mask.
1. Open your image file, duplicate the background layer, shut off its visibility, and work on the Background Copy Layer.
2. Set your foreground color chip to black
3. At the top of the Layers panel click on the mask icon to select it
4. Paint the background with a black brush. You can change the size of the cursor with the bracket keys next to the letter P on the keyboard. If you go too far, switch the color chip to white. (hit x on keyboard) and paint with white. "Black hides, white reveals."
5. You should be able to extract the object as a tight, precise selection.
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