Using this Cobb double adjustable short shifter in your 2004 - 2005 Subaru Forester XT is straightforward. First, make sure the shifter is properly installed in your vehicle. To adjust the shift knob height, you can easily make it 1' higher or 1' lower. If you want to change the throw length, you'll need to cut the trim ring. After that, you can make the throw 10% longer or 25% shorter. When it comes to maintenance, keep the shifter clean. Wipe it down regularly to prevent dirt and debris from building up. Also, check the steel socket head screws periodically to ensure they're tight. You can use any factory or aftermarket shift knobs with this shifter, just make sure they're properly attached. Have fun shifting gears with this adjustable shifter!