Help! I have been steaming the lining paper off a bedroom wall after the wallpaper all just pulled off easily. But under the lining paper I found more wallpaper which has been put directly on the plasterboard, possibly when the house was built in the 60s. It's not coming off easily and I am concerned I will damage the plasterboard with the steaming and scraping - I have already accidentally left a few small holes in it. Do I carry on removing it - there's a Screwfix product for stripping walls that I was considering rather than the steamer - or should I reline the walls over the area where I have taken off the paper? The surface underneath is a yellowish colour and I am not sure if that is the plasterboard coating or if they have been lightly skimmed. There's at least one section (more recently added) where the wallpaper is straight onto bare plasterboard. Other than the section I have tackled, the lining paper on the other walls is in fairly good condition, with a few small bits pulling up.
I have Googled extensively and can't find any clear advice on this situation. Or do I need a plasterer or a decorator to tackle this? I am at a loss - I want to get on with it as I have the whole room to do out (skirting, new carpets, new furniture) but I don't know how to proceed.
Thanks for any help. 