Removing the late-style safety can normally be done without tools.

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Look closely at the groove in which the "spring spindle" rides and you should see a small section of the rear flange that has been milled off to form a ramp. With the firing pin removed, we turn the safety thumb-piece to the vertical (12:00) position, aligning the spring spindle's rounded end with the ramp, and pull the safety off the sleeve using only bare fingers. I find a little wiggling (11:00 to 1:00) helps.

Or, as expressed in the "Description and Rules . . ." -
"11.To remove safety lock, turn it vertical and strike the front face of its thumb-piece a light blow."

Reinstallation does require a tool. The same source provides a useful suggestion -
"TO ASSEMBLE AFTER DISMOUNTING.
1.SAFETY LOCK.—Introduce the point of the tang of a small file, or any tool of similar size and shape, between the thumb-piece and the spring spindle, thus compressing the spring and forcing the spring spindle into the thumb-piece; insert the safety lock spindle in its hole in the sleeve, the thumb-piece being held vertical, push the safety lock forward, gradually withdrawing the tool."