I need to upgrade my site from Drupal 6.3 to Drupal 6.8. However, I have made some changes to the core files when I was developing the theme for my site. Therefore, I cannot update automatically without losing many of the changes to my theme. I also did not keep track of the changes I made. So, this project involves upgrading my Drupal version from 6.3 to 6.8 without disrupting the existing theme. Please let me know what your experience is with Drupal when you bid, and what your general approach will be to solving this problem.
If you are successful with this project, I have a second, small followup project involving Drupal SEO that I will allow you the first opportunity to participate in if you wish.