You can do it from the side like the picture, but i would recommend twisting almost like a screw driver once you have leverage under the overhanging part of the left side like in the picture. Twist the tool so that it starts to put pressure on the top, until you’ll hear it click out. You can be somewhat forceful but it shouldn’t require a lot of strength. Guiding the tool with one hand and twisting with the other is a good way to attempt this.