Pink, I don't know if the informaiton below will help you but I posted this last year for another mum.

BTW - We don't close doors in our house but my SIL does and it works for her.

I went through this a few months ago and it took a good month for DD to settle properly into her new bed. Good to see you are doing this now before you get too big and can't move!! I decided to transition DD in my second trimester and I am so glad I did.

One big mistake I made was to try and get DD to sleep in her big bed during the day and then put her in the cot at night. I did this for 3weeks and every day time sleep was hell. I eventually got rid of the cot and she transitioned within a week.

Tips

Be consistant
Tell her before bed that she is going to her big bed to sleep
Prep room for sleep - draw curtains, take bubs shoes off, put music on etc ( do this every sleep time)
Tell DD to hop up on bed and put her head down on the pillow
Say to her "It is time for sleep"
Rub/pat her if need be (only till she is calm)

ok now the tricky bit.....your dd may not want to stay on bed....my dd got up constantly and this was the hard part!!!!! This is what I did :

Sit beside the bed on a pillow with my back to DD. Everytime she got up I put her back down and repeated calmly...it is time to sleep. I did not make eye contact and I did not say anything else. This may go on for an hour. DD did end up in tears a few times, but she went to sleep in the end.

After few days I moved myself to the door and waited for DD to settle. Then some days I did not have to sit and wait....now she knows not to get off the bed and she loves her big bed.

Don't forget to make a big deal of your dd after she wakes up from sleeping in the big bed.

Goodluck