Chosen Solution
It seems the Mid-2009 Macbook Pro Unibody was skipped or inadvertently left out on ifixit when addressing how to replace the trackpad. Youtube came up empty as well. Here is the link I found but with no mid-2009 guide.MacBook Pro 15" Unibody (Mid 2009 to Mid 2012) Trackpad Much appreciated to anyone who can help with the steps to complete this replacement! Thanks so much in advance, Matt
Your machine is a model 1286 as is the 2012 model. Here’s a guide that will work for you: MacBook Pro 15" Unibody Mid 2012 Trackpad Replacement