On the front of the speaker grill, there is a trim strip. That trim strip is pried up using a small screwdriver, but lift up on the strip with the screwdriver, don't try PRYING it up or you'll damage the dash, but DON'T ask how I know this!!!
Once the trim strip is off you'll see a couple phillips screws, you can get those off with a small stubby phillips screwdriver, should come right out for you then.
The doors speaker R&R is easy once the inner door panel is removed, but getting the door panel off is kind of tough, may want to pass on doing that job yourself.