Haven't done much work on my '02 WRX up till now, so these pop-out tabs are a bit of a head scratcher - would appreciate simpleton instructions on removing them. I need to uncover the front O2 sensor by removing the service hole cover that's fixed in place with 4 pop-out tabs. Do the tabs come out by just prying/pulling on them, or are there retaining tabs on the other side that need to be squeezed so the pins will pull through, or ????? The plastic seems brittle enough so that I'm afraid of cracking something so I'd appreciate some simple guidance.