I usually cut as I go, but on those few occasions that I cut everything first, I really liked it. I keep saying that is what I am going to do always, doesn't happen, LOL. I have a problem standing for a long time, so by starting to sew, I get to sit down.
Be sure to label all your pieces, either by putting into a baggie with the note, or pin the note to the top piece, or you WILL get mixed up.
Warning: Be sure to cut only one block, and test by putting together to make sure measurement are correct before cutting all the pieces. Errors have been known to exist in the pattern. Better to find out before cutting.