How many RM:Traumend episode I must watch before its safe to watch Ouverture?

Last week I watch Traumend episode 7.
I read from http://myanimelist.net/anime/1719/Rozen_Maiden:_Ouvert%C3%BCre that
"This fall chronologically between the 5th and 6th episodes of Rozen Maiden: Träumend but might contain later revelation"

Man, I don't want ANY spoilers. With this "..later revelation" statement already scared me. So, is it safe for me to watch it in my current condition?
If you have some question related to my worry( or is my question unclear?) just ask it and you may edit your answer later.

pkmaster992011-05-07T09:02:44Z

Favorite Answer

it have some stuff from Traumend so i say you finish season 2 1st. it got some stuff later in that season... by the time you are safe to watch it there is only a few ep left so just finish the season then watch the special later

green meklar2011-05-07T21:46:20Z

Ouverture mostly consists of flashback stuff, so it's probably fine to watch it. Personally I watched it after finishing Traumend, but I don't think it matters too much.