The seals alone can do it when over time they stick to the paint, or any little clips or barbed posts which are often used to locate the assembly on the assembly line to then be fully tightened later at the screws. If you pry lightly but in the wrong plane you generally break the posts or clips, you commonly see which direction you have to pry AFTER you have already risked breaking the part and it is off. Like on my Focus cars, I have notes in my manuals about having to slide them in at one angle and then pushing in at 90 degrees to that get them in and the reverse of that coming out or you break them every time and $75 each. You got a brain, use it for something. They use different methods and some are not intuitive to sell more parts.