Hello,
This shouldn't be terribly hard to do. I can do this for you this afternoon.
How I'd process this (myself)
Step 1: back everything up
Step 2: Copy current site and related info to my server, for backup and testing purposes
Step 3: Perform upgrade on my server
Step 4: Verify everything works as it should, noting any issues
Step 5: Perform actual upgrade, resolving any issues, after client has approved the last step and verified nothing is problematic.
I can easily have this done and back to you by tomorrow night (Friday), CST.