Time seems to move slower the faster you move.
At the speed of light, everything would seem to stop.
So, if I move faster than the speed of light, then time would appear to move backwards.
So, by the time you realize you want my help or something my future-self would have already gotten the message and started to accelerate until time moved backwards, then just get to you at the right place and time.
A bit shakey on physics, but hey, this is new beginning.
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather