At times, these deeds are performed by skilled workers, but more often they are carried out by volunteers without much background in a specific field.
وَلكِنْ فِي أَغْلَبِ ٱلْحَالَاتِ ،‏ يُسْتَعَانُ بِمُتَطَوِّعِينَ لَا يَعْرِفُونَ سِوَى ٱلْقَلِيلِ عَنْ هذِهِ ٱلْأَعْمَالِ .‏