Having been a firearms instructor and worked law enforcement / corrections there is a thing called auditory exclusion that kicks in during a use of force incident. When cops that have been in a shooting are asked about it, they usually refer to hearing 'pops' if anything at all. In short, don't worry about it.

Point one: Always use hearing protection when at the range or when shooting outside at targets to save your hearing. If you have a deadly force confrontation it will not be an issue and you don't need to worry about it then. If you have a situation where you have to grab a gun, DO NOT complicate the process with "extra" gear. A good flashlight will be much more valuable.

Point two: Get good instruction on firearm use, practice a lot too as shooting is a perishable skill. Most shootings also take place in the dark or low light conditions so get instruction on that and find a way to practice with just a flashlight too. Last, the choice to have and maybe use a firearm is very personal but also has a huge responsibility.