Tool requirements for moving rocker arms?

1994 Suzuki Katana 600. Manual says to pry the rocker arm aside "using a suitable tool" to get at the valve shims (unlike some other bikes where the procedure is to remove the camshafts).

What would make a suitable tool here? What should I be concerned about?

Is just any old pry tool fine or should I be looking for something with a special tip or some other feature to avoid possibly doing some damage in the process?