Don't worry about it, you won't even hear the gun go off. The limited noise will likely not cause any permanent damage to your hearing. They will be ringing like crazy, but it will go away. It takes protracted exposure or very extreme exposure. Please ALWAYS wear hearing protection when you are training. You can't "get used to" the noise by training without hearing protection. Remember your training, recoil and noise will be the last thing on your mind.
"I'm your brother, just make it count."
Always use hearing protection, shooting, cutting the grass, your wife yelling at you, etc, etc. Always, unless it's life and death, then just stay alive. The 2 or 3 rounds that save your life won't kill your hearing.
There is in life perhaps one fleeting moment when the courage, dedication and resolve of one man gambling against all odds will alter the destiny of nations.
To begin with you may never fire in self defense and what a thing to worry about! Yesuse hearing protection; ears ringing=damage done! Have "artillery ears" from too much time around howitzers w/o hearing protection; also used to go to .50 range(loved shooting old Ma Deuce) and had ears ringing for a number of days; audiologist says damage done! Now wearing two hearing aids; do I wear hearing protection when I shoot? You bet!