Punted many times with other half (and a previous ex), some of the encounters have been reviewed here.
My number one peice of advice is to let her be the one who brings it up. I realise she has mentioned it already, but don't you keep mentioning it, let the idea flow from her.
Also, as someone else suggested, the first time (in fact the first few times) make it all about her, concentrate on her do not touch the WG.
Final bit of advice, make the first night all 'special', tell her to buy a new sexy underwear outfit, do all the candles and music bollocks etc
Trust me hard work on the first attempt, will mean plenty more attempts