A trick I used was to get a bucket of warm water, soak a towel in it then use the towel to get the plywood wet. Take your time with this and try to slowly use your body weight to bend the plywood to the transition. It is possible that the plywood will crack (break) as you bend it into place, you will hear cracking noises before this happens so take a step back if you do.
Have fun.
Blankdecks.
