We moved our son into a big bed at about the age of 16 -18mths (can't remember exactly -he's now 5) He used to get ut of the bed every few minutes and make his way into the lounge. We'd just tell him to go back to bed and if he didn't go back by himself we'd take him back. Tooh a couple of weeks but it happened.
The hardest bit was that hubby's chair in the lounge was behind the open door. This meant everytime Liam came out of his room and I was trying to tell him to go back, hubby would be sitting there, in my view, trying not to laugh out aloud. Try keeping a straight face, enough to convince a toddler, when thats happening.
With our daughter (happening now) we tried moving her into a big bed that had been set up in her room. It didn't last. She'd freak as soon as she woke (thats if we got her to sleep) Now I've just removed the side of the cot so that it is still stable with the 3 sides and secure base and we treat that as her bed. We also have pillows and thick dunas folded in half on the floor in case she falls out. She'd doing really well. The first 2 mornings she's panicked when she woke up and screamed but day 3 and 4 have been fine. Tonight (night5) is the first night where she hasn't gotten up with a cheeky smile and giggle. Hopefully it will be just as easy when it becomes the proper bed.
Good luck everyone!!
Andrae,WA - Liam, Siobhan and Erin