It would seem that such a traveler would have to effect the expansion rates of the entire universe both going and comming, which seems to net out alright, but how to initiate that in either direction, or frame....
I dont think we'll ever be able to do it. And if there are any ETs out there, which seems very possible, I doubt they can do it either. I suspect we'll just have to keep listening.
Part of the problem is everything is moving at great velocity in many directions simultaneously.
The Earth is spinning on its axis, revolving around the Sun, the Solar System is moving in a circular orbit around the Milky Way galaxy while also moving in a sinusoidal manner above and below the galactic plane, and the whole galaxy is moving away from all the others at a huge rate.
Exiting the space-time at your starting point isnt nearly as big a problem as entering the space-time at or near your destination. You might wind up in free space, inside a rocky asteroid or the corona of the nearest star. Two of those choices are not optimum for a return trip.
A series of short hops would most likely be the safest method to allow you to get your bearings correct for the next jump and avoid being vaporized by a nuclear furnace.
Remember, gravity is a depression in the fabric of space-time. The larger the mass, the greater the depression, or ‘gravity well’. So you would want to make sure your jumps were well away from any large masses. Imagine materializing in the upper atmosphere of the planet you want to explore, only to burn up like a meteor as you plunge through the sky at thousands of miles per hour. You want to come into the system out near its outer edges, like Pluto, then use conventional methods to ‘fall in’ toward the inner planets.
Of course accidents of chance, like materializing in front of an undetectable cometary body might ruin your whole day..........