if you have a set of ring pliers thats what i used. rotate the clip so you see the gap and just spread the gap. you can also just use 2 screw drivers and just bend the clip tabs alittle. dont worry to much since it can bend right back.
and just incase you havent... PAINT THAT SUCKER BEFORE YOU INSTALL IT! i see quite a few in my junkyard that are rusted to hell from people just slapping them in the truck. only takes another 1/2hour or so to clean and spray paint it in the sun. it didnt take me to long to swap mine out like said already that clip is the hardest part with it being so small and cramped! and the 4bolts that hold the booster to the firewall i just used some really long extensions and a swivel joint on the socket end. much easier to quickly remove and reinstal after nuts started of course!
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THATS IF that is the type of clip you have. the other type ive seen is just a bent over tab. tho i dont have a close up picture of that style. it was on a older obs hydroboost.