Answers:yes you may but place the lining paper horizontal very first and that means you will not get appears to be lining up collectively.
if its all all set up placement your wallpaper so it overlaps the ling paper appears to be .make positive you employ a good wallpaper paste to repair the two papers
Answers:If the lined paper is on okay, no troubles. in some cases the new paste will soften and even loosen the lining. check by placing paste on a number of it.