Need some advise on transitioning my son to his own bed

I have co-slept with my son since he was born. He is now 8 months old and I really want to transition him to his own space. I have a pack and play that I will set up in my room beside my bed, so that he can still be near me. But what can I do to help the transition? I know he is not going to like it. The few times that I have tried in the past, he just lays there and cries for hours until I put him back in my bed.