If you’ve followed the above steps and find the colours in your subject don’t quite mesh with your new background, there’s a quick fix for that.  Duplicate your new background layer and move it to the front. Then click Filter, Blur and Average.   Hold Alt/Option and click the space between the blurred layer and your subject to create a clipping mask. Then, just change the blend mode of the blurred layer to Soft Light and reduce the opacity to a level you think looks good. That's it!