|If you've tried using sew-in interfacing in the past for your facings or collar pieces and have been discouraged because of buckled or crinkled seams, then this tip might help you.
Instead of typing it all in here, I added a little tutorial to my Flickr page that shows a nice way of achieving smooth finishes and seams when using sew-in interfacing. If you click up there on the little camera icon where it says "Web site/Url," it'll take you to the correct page. Once you get there, my explanations are shown below the pictures, and you can just click on the next thumbnail picture to continue through the process. If you want to see something bigger, then you can click above any of the pictures on the "All Sizes" link, and it'll give you a choice of sizes for viewing.