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Once you remove the side trim pieces and then A pillar you can just stick a finger under the speaker cover and pop it up from there.
Full disclosure, I thought for sure my dash rattle was coming from the front speaker grill but it ultimately ended up being a combination of the wood dash piece (removed it, felt taped plastic connections) and steering wheel plastic housing (Removed, felt taped, foam).
Edit: Just realized you guys are referring to A pillar speaker grill rather than dash speaker grill. My apologies but if you are having trouble locating general rattle from the front localized area you can check the spots i mentioned above as well if A pillar speaker grill doesnt resolve it