Preparation of fabric is very important, so I've given my fabric a spray with Best Press, then using a warm iron, I've pressed the fabric on a wool pressing mat to remove any creases. I'm using a lightweight fusible interfacing, Vlieseline H180 on the wrong side of the background fabric. This gives a bit of "body" to finer fabrics and prevents shadowing of threads from the back. When using a fusible interfacing, make sure the fusible side is against the wrong side of the background fabric and take care to read the manufacturers instructions regarding the heat setting you need for your iron and avoid getting the fusible part of the interfacing on your iron - I always press from the right side of my background fabric, to activate the fusible backing, ensuring there are no threads caught between the fabric and interfacing...
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