The 2 plastic brackets that let the lower case snap on or off are broken in my MBP 15" Unibody 2.53GHz Mid 2009 (A1286)....

Actually, I was trying to follow the "Replacing MacBook Pro 13" Unibody Mid 2009 Trackpad" guide (I own a MacBook Pro 15" Unibody 2.53 GHz Mid 2009, just like in the original post). I followed the guide up to and including Step 5 (removing the battery), but I'm stuck at Step 6. I find that the trackpad connector is somehow inaccessible in the 15" version. Is there a more suitable guide?