Just use modge podge. Follow directions on bottle.
Brush on a layer of Mod Podge, then - while it's still wet - apply the wallpaper. Press it down tightly. Once your piece is covered to your satisfaction, let the Mod Podge dry, then apply 1 or 2 coats on top to seal the wallpaper to the piece. You can use more coats of Mod Podge if you think your piece needs it. Wishing you the best.
Here are some tips: https://homeguides.sfgate.com/decoupage-wallpaper-72568.html
This might help: https://www.hometalk.com/3095999/textured-wallpaper-on-furniture
Never thought of trying that. Measure pieces of paper and cut to fit each piece you want covered. You can use 50/50 mix of white glue(Elmer's etc) and water. Paint on mixture as you go, place wallpaper and put another coat of glue mix. Let dry and then put a second coat of glue that goes beyond edge of paper. The glue dries clear.