"Time travel doesn't take a machine with flashing lights, spinning dials, and a warp engine--in fact, you were born with the power to navigate the timestream. Impossible? Not with the help of Dr. Quantum! The renowned "superhero of science" Fred Alan Wolf makes his triumphant return in Dr. Quantum presents do-it-yourself time travel. On this six session audio journey down the wormhole of infinite possibility, Dr. Quantum provides you with the physics, insights, and practices you need to expand your power to journey through time and space"--Container.
In my opinion, Dr. Quantum tries hard to explain something unexplainable. Only logic seeks and deals thoroughly with explanations and there's nothing logical about remembering your future or imagining your past, so in this case, one could say it'd be illogical to use logic for time travel, even when talking using only the mind.
One needs a vehicle or a vessel to travel. In my opinion, Self is this vessel. Change the Self; change the vessel. Once the vessel has changed, time changes.
It's our personal histories that anchor us to our current vessels, strengthened by our beliefs. So, if someone wants to time travel all she/he has to do is deal with her/his past and change beliefs accordingly.
How he does that? One thing is to stop repeating it. Then build up the courage to either do a 10-day Vipassana or just start meditating here and there. That's one way. Depending on how you want to go at it, there are other ways too; another one is writing an honest autobiography and detach from your current vessel by reading it objectively without the slightest emotional attachment (I think Christopher Priest did that in The Affirmation); another one is deep hypnosis.
The coolest one I've encountered is a set of exercises found in Sergio Magana's The Toltec Secret. They include three masks, one mirror and a lot of honest talking.
Time Travel is easy, Finding the balls to switch vessels is the hard part.