I second the trial run. Maybe more than one time before you go. Perhaps you can start having your dh handle bed time 3 or 4 nights a week (starting off with one or two nights a week and working your way to 3 or 4 nights a week). Do the grandparents live nearby? Maybe they can come to your house and do bed time one night a week while you go out to a book store or a movie to relax.
Good luck.
Good luck.