I shoot suppressed. It’s a federal process, so it’s the same across the US. Go to dealer, purchase silencer. Fill out paperwork with the dealer. Get fingerprints and pictures taken. Complete paperwork. Send in paperwork with $200 check to BATFE. Wait about a year. Dealer receives tax stamp. You go to dealer and pick up stamp and silencer.
I’ll throw one more thing in there. I suggest buying it under a trust. This way you can add multiple people if you would like. If you are the only one on it you have to be there when it’s being used. I have my daughter, 2 sons and wife on mine that way they can actually take it and use it if they want or if something ever happened to me they could have it without doing all the paperwork over again.