Cabin air filter change involved removing the glove box, unsnapping the old one and inserting the new. One of hte easier jobs to do. The photo illustrates the difference, but in normal daylight the old filter did not look too bad.
A soft tipped philip's head driver can prevent scratches on the screw heads, that's all you need. I purchased my filter from eBay Motors for about $10. You can probably use an HVAC filter if you want a more DIY solutoin.