If I recall…
Pry the horn pad off (gently but it just clips in)
19mm socket, on an extender
Disconnect horn (think it’s on spade clips)
Mark the center position - Center or similar - before you pull the wheel. Thinking aloud, I wonder if some dotology could be used… dab of paint on splines on wheel and column after the nut is off but before removing the wheel…
Pull the wheel off