Yes, in fact, proper surface preparation will make it easier for you to hang your wallpaper, and it also plays a very important role in assuring satisfactory results. Basic preparation steps include patching any cracks and/or nail holes, washing any greasy or dirty areas, and using a primer/sealer made to be used under wallpaper. There are other steps that should be taken with new plaster walls, new drywall and other surfaces including paneling and tile walls. Learn more about more wall preparation here.