Realistic Background Change in Photoshop

I need a Photoshop expert to change the background of a picture. The new background should be highly realistic and almost indistinguishable from the original.

Key Requirements:
- Replace existing background with a new one (nature scene, urban setting, or solid color)
- Ensure the new background is highly realistic, almost indistinguishable from the original
- Adjust lighting in the new background to match the subject's lighting exactly

Ideal Skills and Experience:
- Proficiency in Photoshop
- Strong understanding of lighting and realism in images
- Experience in background replacement

Please provide samples of similar work. Thank you!