Update Existing Wordpress Website

I have a website already setup, but now it needs the content changed. We have to update a number of pages, maybe about 20. I also have 27 pictures that need changing. Slider Images need changing. The most tricky change is that the site hasn't been udpated since May last year, and it we need to get about 70 new pieces of content from the old website version. This is for a church, and each Sunday there are two sermons (mp3 files) added. We started building the site last may and imported all the mp3 files into the website, but then stopped building. Now we are ready to finish, but we have to make all the changes and also update the mp3 files again from the old site. I would love to have this done within 3-4 days. I have a budget of $250-300 for this set of tasks. Once a freelancer is selected I will provide the cpanel login, wordpress login (for new site) and joomla login (for old site). I will also provide a link to google drive with a list of all the pages and the changes, and the photos for the pages. There is also a styleguide for this church. We need to update the fonts and colours of the websites styles in css to match what the styleguide says. The styleguide is also in the google drive link. Please look in the attached [login to view URL] to see the name of the old site and the new site url.