Photo Editing and Background Replacement

I have several pictures of myself (mirror pictures) that I want to merge with other backgrounds. Additionally, I need some edits on my arms in these pictures to make them straight instead of bent. The goal is to use the mirror picture as a portrait with the new background.

Ideal Skills and Experience:
- Proficient in photo editing and manipulation software
- Experienced in merging photos seamlessly
- Able to follow specific instructions for body editing
- Creative with background replacement

Please note that I have the backgrounds ready for this project.