People Background Replacement in Photos

Hi

I'm looking for someone able to do some photo-editing magic.

So I couldn't attend my uni graduation ceremony during the covid pandemic and my mum is desperate for some graduation photos to display at home.
Luckily my sister attended her graduation ceremony with some professional pictures taken, I need someone to remove her and replace with me in two copies of the photos. One of the photos would be just me and the other would be with my parents.
I'm male with a more muscular physique. The graduation ceremony gown would be different because we graduated from different universities.
I will provide several photos to edit or copy from:
- Two of my sister's photos: a portrait, and a landscape with my parents.
- Two portrait photos of the official graduation gown won by a model: one frontal, other a side photo.
- Several photos of me to work with.

I'm hoping it won't be better to just hire the gown, dress up and take some professional photos.

Hope to hear back from you