What is the easiest, most comfortable, and best way to slaughter a chicken, and is it better to slaughter it standing or lying on its left side with its wings placed under the foot of the slaughterer?

The method compliant with the Sunnah for slaughtering chickens is to lay them on their left side, facing the Qiblah. This makes it easier for the slaughterer to use the knife and hold the head. This act is recommended as an act of mercy and kindness towards the animal. Laying the chicken down is not a condition for the validity of the slaughter; if the chicken is slaughtered without being laid down, it is permissible.