I'll cut enough to make one or two blocks to make sure I understand the instructions, then I'll cut the rest out to make sure I have enough to go around plus some left over. I even cut out the binding, stitch the strips together, press them in half and roll them up on a tp cardboard. I write the name of the quilt on the cardboard and place it into a container just for bindings. This way if I put the project aside for a while, I don't have to remember whether I have the binding or not as I always get it put together at the begining plus add another 10 inches for good measure. I'll use my home-made alphabet pins to keep what I've cut under control.
I goofed up on my last project which of course isn't finished yet and didn't cut all the fabric at the beginning as I didn't know just how much I would need so when I went to cut more, I cut from the wrong fabric but luckily was able to use the miscuts for something else within the project.