Sorry, only just came to this question.
All these space bars have clips on the top edge, and slide guides on the bottom. it'll be 4 on top, 4 on bottom, so they are stiffer to get off. But if you start on the left or right side of the key with a thin bit of plastic, making sure to get between the keycap and the scissor clip (not under it), roll it around the top corner and slide it along the top edge, you should feel the lips pop off as you move along. You'll need to come out and go back in after each clip pops off. but once the first one pops, you can get your nail under the corner you just passed to hold it up.