A few tips:
- Get a piece of wire or a string to hold the oil filter away from the bracket;
- Don't try to find the nut on the bottom - there's none, the thread is in the bracket;
- Careful when unscrewing the mount from the bracket - it may break off at the bottom and give you hard time trying to extract something you can't get a hold of (lower left piece on the picture above).
Check yours when you change oil - chances are, it needs replacement now, or will soon.