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OK. You're setup is looking good from the pics. You have all the hyd connections plugged. Now turn the VB over and you should see small holes as shown in the pics below. Using a rubber tip air nozzle and using about 50 psi of compressed air, pressed and blow into one of the small holes while covering the rest of the remaining holes with your other fingers. This should just be a quick burst for a second.
Note make sure you only removed one circ clip and using a rag to catch all the parts that will come out. If the spool valve (which houses the small check valve and spring) gets stuck and would not come out all the way. Push it back in with a slight tap using a large screw driver. Before trying again, clean the lip and surround area on the hole until bare metal. Try blowing again.
If it only comes out a little bit, put a drop of oil and push it back in again and then blow it out again. And yes, it will eventually come out. If it's too stubborn switch to the other spool valve and keep trying. And yes, as soon as you get one side out, all you need to remove the other side is to push it out with a wood dowel or similar tool except metal.
And yes, as soon as one spool valve gets out the shuttle valve goes out with it.