A lead or other member may be implanted into the body, and typically at the heart, by a method which comprises and following: inserting one of a pair of pivotally attached jaws of an attachment tool through a hole in a body membrane, particularly the parietal pericardium surrounding the pericardial cavity. The other of the pivotally related jaws is placed outside of the body membrane in a position of registry with the first of the jaws. The jaws carry an attachment member which is to be attached for securance to the body membrane. The jaws are brought together in pressing relation with the membrane and attachment member positioned between the jaws, to cause attachment of the attachment member to the membrane. The lead may be pre-attached, or subsequently attached, to the attachment member after the above process steps.