I would be delighted to do this for you. I have had a lengthy experience with Photoshop, using it for practical needs (such as what you need) but also for artistic and design purposes. I also have an A at Higher level: Computing, where I learned a lot about multimedia (as well as programming and computer architecture).
I understand your concern for confidentiality, I am using a secure broadband connection with a dynamic IP. I can also keep the pages on a USB/portable HDD instead of my PC while working on them. Upon completion of the task, once I know you are satisfied, I will remove any file you gave me from any backup I made.
I would like to invite you to contact me if you are interested in hiring me for this task, so that we can discuss the specifications of what you need, and hope to hear from you soon.
Best wishes,
Sam Walls