Remove Backgrounds From Group Photos

I have 3-4 high-resolution group shots, each containing around 100–150 people, and I need the entire background taken out so the images sit on a completely transparent layer. No glow, drop shadow, or other post-effects are required—just a clean, crisp cut-out of every person... (Budget: ₹600 - ₹1500 INR, Jobs: Adobe Photoshop, Background Removal, Graphic Design, Image Analysis, Image Processing, Photo Editing, Photoshop, Photoshop Design)