No need to remove the whole door panel if you just need to swap out the speaker grill. Take a credit card, slide it between the silver ring and the door and keeping it curved so it doesn't dig into the door, slowly pry it out from the front of the door closest to the hinge and work your way back. After you get that out, the speaker grill will pretty much pop right out by sliding the credit card under the grill and giving it a slight twist.