First you practice the instant overhead blockstring + confirm in training mode, then when you have it down 100%, you think about doing it in a match, not the reverse. This x4 blockstring is merely a method to practice faster. You can just go (5B > j.2DA > j.B) x4 as well if you don't wanna think about the fuzzy guard just yet. So do practice that!
Also Heartless I will be available pretty much 24h/24 during the whole week to play. Not on netplay, mind you.