OK, here we go. Firstly I edited the image so the subject was to my liking, ignoring the background for the moment. Then once I had done that, I did as follows:
1. Open up your image in whatever software you use, then right click on the image > copy:
2. Right click on the image again > Paste > As new layer:
3. Then go to 'Adjust' in the menu at the top > Brightness and Contrast > Levels:
4. Move the sliders around until you get the look that you want for the background and click OK:
5. Select your free hand selection tool:
6. Draw a rough line around your subject to cut away the bulk, a bit quicker than using only the eraser tool:
7. Cut:
8. Selections > Select none:
8. Using your eraser tool, rub out the edges. Note the settings of the tool above the image. I find these give the best blending results for me:
9. Lastly, you want to merge all layers before saving like so:
HTH. Again though, this is what I have done to achieve the results I want using the minimal space and equipment I have. Hopefully at some point I'll have the right gear and won't need to faff around quite so much, lol .