Pleeease help me on how to give a hickey?

okay i have been with my boyfriend for like 5 months now. he has givin me sooo many hickeys on my neck. and they are huge. he wants me to give him one. and i want to too. but i have no idea how. i looked it up on how to and i practiced on my arm but i just cant do it. no matter how much i suck i cant do it. help!!!!