Fixed blade Broadhead tuning question

[Pekan]

Curious how many guys out there are tuning their arrows/brodaheads?

From youtube videos I've watched, sounds like you need to pretty much start with a new arrow and align the insert so the blades and fletches are in the same line. Is this what guys are doing?

Also, how critical is the shaft cut for square? Wouldn't the insert sit square even if your cut is off by a few degrees?