If it is possible you would have had to have been there in the first place, it would be similar to a pensieve in the Harry Potter series (experiencing your memories again.)


Otherwise you might accidentally kill an ancestor which would mean you wouldn’t exist and therefore not have been able to kill your ancestor, or anyone that hated you or had a falling out with you would simply go back and easily remove you from existance...


If time travel were to exist in the way it is displayed in Science Fiction than we would simply hand down the greatest ideas to someone years before they should figure it out, it would only mean that we would have to imagine something into existance because once we thought of it then someone would simply travel back and hand it to them.


This is my reason for thinking that the most popular idea of time-travel is in the category of Science Fiction, plainly because it is fiction.