So, you're headed south and the wind is behind you so you are on a run. Correct? You want to turn around and head North (or thereabouts). You have two choices, tack around or jibe around.
Uhm, not really. He's on a run with the wind behind him. One can only TACK through the wind.
Depending on which way he chooses to turn, he could make the turn without jibing, which would be easier.
The answer, to the OP, is to choose which turn you want to make, jibe or not, obviously easier without jibing.
Then make a slow 90 degree turn, and while doing so trim the sails to a beam reach. You'll now be going either east or west with the wind coming sideways.
Then turn further up into the wind to close hauled while trimming the sails more.