You’ll be fine! Don’t let it stress you too much. Seriously, going more than one day and being familiar with the process is what you can do. And sounds like you are doing
I’m not saying this to brag but as an example of the odds. We’re 5 for 5, all of them the morning attempts, we never even needed to attempt the 1pm drop. Of those were 2/2 back when you needed to be inside HS, 3/3 on another trip from inside our hotel. I even beat out DS19 on his 11Pro with my iPhone 8.
Even when they are gone in 10-15 seconds… it sounds much worse than it actually is. Count out 10 seconds. That’s a long time to hit the Join button 3 times. Even with the risk of maybe phone freezing or whatever, if you have other family members trying too that won’t happen to everybody.
It’s extremely rare for somebody to prepare, try a couple times and still fail. The odds are tremendously in your favor. I’ve yet to hear someone say they had 2 HS days, tried 4 attempts between the 7a and 1p drops and not get a BG. MTFBWY
Goodluck!