You have to find someone with tons of experience. I’d request detailed pics of their work. What I’ve found is that it’s really difficult to get a nice fit around the ears and nose.
A few years back I changed out all the wire from the substation to my electrical panel. While I didn't notice much difference in audio quality or noise...clothes out of the dryer were absolutely softer with an improved scent.
I make my own with these:
https://btpa.com/Bulk-Product/Cable/Guitar-Line-LevelBP/CA-0446.html
https://btpa.com/Bulk-Product/Cable/Guitar-Line-LevelBP/CA-0678.html
https://btpa.com/Bulk-Product/Connectors/Phone-Plugs/NP2X.html
https://btpa.com/sp500.html