With out the help of cronos [father time not the titan] , it is physically impossible to travel through time. period.
You can have visions of the psat or future, re-experience items of memory be them yours or other but you are not actually there. it's like a dream.
Travelling through time, if it were possible, would be so dangerous that even maraquden, pronounced marah qu den, laws would with hold the information on the know how.
While what you are thinking of sounds like holywood nonsense, there is one fact in holywood that would hold true:
You change one tiny detail your hole future changes. Everything has a reason.