Dude,
My 96 is the same way as I imagine most mustangs are. Here is how I do it and it works every time. Go to AutoZone or Checker, pick up a 10 inch ratchet extension with the plug end on it for like 8 bucks. Then when you do the plugs. Remove the plug wire, slide the extension between the lines and wires (trust me there is plenty of room) and run the extension into the opening and remove the plug. Wall LA! It takes less than 20 minutes to do plugs and I have never had to remove all that **** with that extension. It saves time and hassle. Good Luck!