You've probably started the transition by now, but here's what worked for us. We got a quilt set with his favourite character on it to get him excited about his big bed. We talked about going into the big bed etc in advance. We started with the day sleep idea, leaving the cot in his room for night sleeps. When it came to nighttime he refused to go back into the cot. DS was over 2 so he was probably overdue to move to a bed which made the transition quick and easy.
We just made the change, bed in, cot out! Made a big deal about "big boy bed" and he went really well. He has always been a pretty good sleeper though so that probably helped.
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