Originally Posted by WATacoRider
To my knowledge, there's only 4 retainers along the bottom. It's pretty obviously. They are all aligned in a row right along the bottom.
Oh wait a min, when you were talking about the extra 2 in the fender lining, you must be talking about the ones you turn a 1/4 turn.
Sounds like you got everything. It just takes force to pull it by starting in the corner.
Done! Very happy now! Also confirmed：
You can either take off the three quarter-turn retainers which are behind the four plastic retainers as done in the video, or take off the four plastic retainers on the bottom as done in the pdf. The four plastic retainers just connect the front bumper with a lower part (don't know what it's called but I circled it in red in my picture).
The most scary part indeed is pulling off the bumper. I was thinking I was going to break it too. But after receiving a quote from dealer for $180 to remove the bumper, I made my mind to do it myself.
Thanks to WATacoRider! Without you confirming I was doing the right way, I wouldn't be able to make my mind to pull the bumper off!