If you want to avoid annoying paradoxes, use the multi-verse theory (i.e. lots of different dimensions which you time travel to and affect), or if you like paradoxes, make everything happen in your own universe (i.e. grandfather paradox).
I personally like the idea of time being a concrete dimension, so removing yourself from that dimension means you can essential re-insert yourself at another point (like jumping out and then back in a pool) in time. *just had good idea for own story*
In current realistic science fiction some sort of large machinery would be better suited (think hadron collider by-product), but if you like more fantasy then use mental abilities, or if you want retro, go with aliens.
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