How can I make putting up patterned wallpaper around a vent hood easier?

I’m looking to add some wallpaper to this wall (marked in pink) but I’m not sure how to begin! I’ve got all the tools and plenty of wallpaper, but it’s a patterned one that needs to be aligned perfectly. I think removing the vent hood temporarily would make things a lot easier, but I don’t think I’m allowed to do that…
By the way, my friends had a great idea of using parchment paper to create a template around the hood, which is brilliant.
Do you have any other tips or suggestions to make this process as smooth as possible?