Test Limits, Paradox Possibilities and Space Control.

Then something hit him like a truck, would he be able to move in space as well as time. Else he would be unable to do anything more then the few days since the movement of the earth wouldn't allow him to move without throwing him into outer-space or somewhere else on the earth which might be deadly to him.
"Could I get atleast some space control, not much just location changing with my time control and maybe the ability to turn into a ghost so I don't get noticed or can't become stuck in object there weren't in the present?" John Doe looked around for a few moments before sighing and muttering to himself at the lack of change or response, "Ofcourse I can't do that, nor can I stop time else I'd suffocate. Why did I think time control was a good idea."
"Fine! But only because you poked so many holes, now don't complain anymore!" boomed the voices from before.

After a few minutes to get the ringing out of his ears, John Doe was sure he was ready to take on the world! Now to just know if he did anything that he wouldn't be thrown into non-existantance because cause and effect or a paradox. Best way to do that is to give his younger self something which wouldn't exist in quite a few years, something that can't easily break though.

Getting dressed took some minutes before going through what he owned to finally find a sturdy Iphone and charger he had around as a back up phone, then he needed to remember where he used to be where he could find his younger self. After thinking about certain places before remembering a certain place and certain advice I wanted to tell the younger me.

With that decided, I headed towards a park that I used to go to when I was younger when I used to live in the old house of my parents before they left towards some more tropical lands because they didn't need to take care of you or your siblings. Now enough reminiscing and become something you should be reminiscing about!

Concentrating on the past and holding the point of earth while also going ghost until he could see his past self walking between an alley way and the park with his past parents and siblings at the park already. I walk up to past me and greeted him.

There was a bit of panic on him before I told him that I was from the future and came baring a gift. Me being an 7 year old at that point of time totally believed me and accepted the device and charger before giving salute before disappearing back to my own present. I took a moment to look at myself and smiled that there were no changes, besides change in memory that it happened. You don't remember clearly the event, but the place does remind of it.

Now you've done that and made sure you won't die because of a small change in history and know what will happen, now should you step it a bit up with another interaction that might have a medium effect or should you change a big historical event?