I have learned...trace the outline on the wonder under (paper side) and leave extra amount around it. Be sure to press (dry iron...not steam) onto the WRONG side of your fabric .... ask me how I know that. LOL Then I do something else for at least an hour...you want to let it sit awhile before you go on. Many times I will press my wonder under on and not even go back to it till the next day. Then, cut on your drawn lines and it should peel easily from the paper backing. I have always found it very difficult to peel that paper backing away if the wonder under is old or has been in a very humid environment. And, I learned the 'let it sit awhile' in a class I took once. Once you get the hang of it, you will enjoy using the wonder under...I always keep some on hand.