I will add a couple of tips about standing up together:
1. I notice it helps keep the bike motion "quiet" when I keep the tip of the saddle between my legs. This requires that I lean over the bars a little, but it's not that uncomfortable.
2. My wife likes it when I call out the cadence with a "one two one two" or "nice-and-easy-nice-and-easy" or something like that. Problem is, I'm usually breathing too hard to talk when standing...
Good luck, the best thing in my opinion is just get out of the saddle together and try it for short, frequent bursts until you're comforatble with it.