I have already pulled off my wallpaper by hand. Today I have tried using DIF but I don't know if I am using it correctly. I followed the instructions on the bottle but when I scrape with a putty knife it comes off very little. I have applied 2 coats of DIF. I am new to this and would appreciate any instructions by anyone who knows what they are doing. I am also worried about making holes in the wall with the putty knife while I'm scraping. Thanks.