The truth is this hatarah is controversial so it is best to ask a Rav before relying on it.
Should I ask him before, after or while he does hataras nedarim?
Every shul or yeshiva that I’ve ever been in on erev Rosh Hashana has done it.
Do I still need to ask? Also, do I need to ask him every year, or is every other or third year okay? After all, maybe he’ll read the CR and discover that for all these years, klal Yisroel has got it wrong.