Definitly night time. When Jenna went into her bed at 16m (the first time ) we still slept her in the cot at daytime causeshe was just constantly wanting to get out as she plays in her cot before and after her nap.
Nighttime was lots, lots easier! She usually just went down at night time.
Now she sleeps well both times in bed, but we usually need to give her books to read in her bed before she goes to sleep during the nap time in the day.
How exciting Sarah! I hope it all goes smoothly.