When it comes to the chest protector, there is one major thing I see a lot of catchers get wrong. That error is having their chest protector sag way too low under their neck. You need to make sure the throat guard is high enough where it protects your throat! That way when you block, your mask and chest protector work together to cover your entire throat and keep you safe!
The best thing to do when you're fitting your chest protector is to put it on and start by tightening it up to sit and protect your throat. Once you have it fitted properly height wise, then you can tighten it around the waist area. You need to make sure this fits properly! A well-fitted chest protector will keep you from getting hit in weird places during a block, and if you can move comfortably in your protector, you'll have more confidence to play.