You asked for TECHNIQUES, I say make sure that both are done at the same time to lessen the pain. Continuing the tradition in my family; my daughter got her ears pierced at 3 months old (she'll be 7 months on the 5th) just as I did and my mom did and so on. I took her to walmart because her pediatrician no longer does it and recommended WALMART.
INFECTIONS are preventable if properly cared for however I did have a friend who went to Claire's and 48 hours after her cartilege piercing; she took the earring out because her ear was red and swollen and as soon as she removed the earring; there was an outpouring of blood so make sure they properly line up the center of her ears.