I can't see how this will be "smooth sailing". Harry is still magically undertrained and woefully inexperienced, especially against an old fighter like Voldemort. Harry does have three advantages - first, his wife is with him; second, he has a phaser, although I doubt it'll work in a magic rich environment; and third, surprise, as I doubt that Voldemort is expecting any visitors soon.
I don't think Hui and Harry will come out the "visit" the same. Due to Luna's prophecy, I'm not sure their marriage is going have a smooth start.
Good luck with the next chapter!