Mistakes in this hobby are easy to rectify. If, down the line, you decide you've made a mistake in a gun purchase, sell it off and get what you want. It happens.
I’ve not seen the topic addressed from the standpoint of “biggest mistakes” first time buyers make.
I was hoping that some of you more experienced owners, and those who own more than one defensive handgun, would be willing to relate any mistakes or oversights you made (if any) in your first purchase and that should be avoided by other first time buyers.