Only two very big capacitors at the input stage (220v) are dangerous.

Good news is the capacitors do not hold much charge; you can short-circuit them with a screw-driver. There will be some small sparks, but not much. Of course do not hold the metal part of the screw-driver, or you will be screwed.

These capacitors are nothing compare to audio capacitors (10000 uF+); they can explode like mini grenades