Think about how you broke in a TV set, stereo or AV reciever or any other audio / video component you have ever owned.
The preamp is just electronic parts in a case. No need to over think it.
In fact it might be fun to listen closely right out of the box and take notes about how it sounds good and bad. log the hours and tracks you played. keep notes for several weeks and report back how different it may sound after 100, 200 or 300 hours.
Then YOU will become the expert.
