Make Squarespace Design Editable

I already have a fully-fleshed design and the relevant HTML/CSS/JS code. All I’m missing is the Squarespace magic that will let me update text, swap images, and adjust the navigation menu without touching the code every time.

Here’s what I need from you:
• Import or rebuild my existing layout inside Squarespace so everything looks exactly as it does in the original files.
• Set up editable regions for all text, image blocks, and the main nav—no hard-coded content.
• Keep any custom CSS or code injections tidy and well-commented, so I can tweak them later if necessary.
• Provide a brief hand-off note (screenshots or video are fine) that shows where to click to update the three editable areas mentioned above.

No extra plugins or SEO add-ons are needed right now—purely a clean, maintainable Squarespace implementation of the design I provide. If you’ve done similar conversions before, I’d love to hear how you approach content blocks and menu management so everything stays user-friendly for non-coders like me.