For the A pillar trim, you need to first remove the weather stripping from the black channel it’s glued into. Be forewarned tho, it’s a bear to get out, and you probably won’t be able to do it without destroying the weather stripping. Many aftermarket vendors offer replacements tho.
Once you have the weather stripping removed, you’ll see the screws that hold the channel onto the A pillar and roof. (It’s all one piece). Remove those and the channel and you’ll see the second set of screws underneath that hold the chrome trim on.