1. Open the image in Photoshop.
2. Duplicate the background layer by pressing Ctrl or Cmd + J. This allows you to revert to the original image if needed.
3. Select the Object Selection Tool from the toolbar (or press W for the Magic Wand).
4. Turn on Object Finder in the options at the top of the screen.
5. Click the icon to display selectable objects in the image.
6. Use the rectangle or lasso tool to select the object(s) you want to remove.
7. To delete the selected object(s), press Alt or Option + Delete (for Mac) or Shift + Delete (for Windows).
8. If the fill dialog appears, choose Content Aware Fill and click OK.
9. Press Ctrl or Cmd + D to deselect the area.
10. For a more professional result, create a new layer and use the Clone Stamp Tool (press S) to clean up any remaining artifacts from the removed object.
11. Use the Spot Healing Brush Tool (press J) to remove any remaining imperfections.
12. Merge the layers by selecting them and pressing Ctrl or Cmd + E.
13. To replace the sky, go to Edit > Sky Replacement.
14. Choose a new sky image from the My Skies folder or add a custom sky using the plus icon.
15. Adjust the position, scale, and blending options of the new sky to fit the image.
16. Output the sky replacement to new layers.
17. Create a Levels Adjustment Layer above the new sky layer (Layer > New Adjustment Layer > Levels).
18. Clip the adjustment layer to the sky layer by clicking the clipping icon in the Levels properties dialog.
19. Lower the contrast of the new sky by adjusting the dark and light points in the Levels Adjustment Layer.
20. Fine-tune the adjustments to make the new sky blend seamlessly with the rest of the image.