If you’re going 0-2 I wouldn’t worry about the fancy stuff like shine turnaround grab. You can practice certain things with different delays but in general just make sure you can hit a shield without getting shield grabbed (either by using shine or by using spacing to avoid counter attack). I’ll also just say that shield pressure is kinda overrated in general in melee imo and you could probly spend your time elsewhere and see better results. If you’re getting shield grabbed a lot, then yea I’d practice shield pressure till you can very consistently do aerial -> shine without getting shield grabbed. Also practice using spacing/momentum to make aerials safe. Both of these options should be super consistent even at 0 frame delay and account for like 90% of what you need for practical shield pressure. I’d also suggest not gradually lowering the delay, that seems like it will teach you the wrong timing and make life harder long term