Organic mercury compounds can look like water and absorb quickly through skin, they can be potent enough for just a drop on your skin being deadly, even if you have gloves as it can penetrate quickly through many different rubbers. Metallic doesn’t kill you even if you ate it*. With metallic mercury highest risk is vapours but unless you heat it it will only become a problem in poorly ventalated areas.
*assuming you have no open wounds on your digestive tract and minor chronic damage might be still caused depending on amount and frequency.