Update wordpress theme and carry over custom CSS work previously done

Hello, *PLEASE READ CAREFULLY, THIS PROJECT NEEDS TO BE COMPLETED WITHIN 36 HOURS* I have a wordpress website that has custom work done to it. I've had multiple freelancers code a custom header, sticky header, footer, smooth scroll, and other CSS and similar style effects. I have no knowledge of CSS and style sheets, so I haven't updated my theme because I've been scared to lose all of my custom changes. I now need my theme updated (Ronneby theme) as it comes with an update for WooCommerce, which I need badly. I need someone to update by theme (via FTP) and update WooCommerce to the newest version. The most important aspect of this project is to have someone carry-over all of the custom changes that were done that disappear once the theme is updated. I will require the freelancer to run a backup of the website incase they are not able to do so. Tasks: - Backup website + database - Take snapshot of each page to know what changes need to be made if those changes are lost - Update theme - Update woo-commerce - Make all CSS / style changes to match site before theme update *If the freelancer feels its better to use a CHILD theme moving forward to make these easier in the future, that's fine. *this project is not completed until all changes are completed. I need this project completed within 36 hours (11:59pm EST on Sunday). To have a look at the website and changes