If it's a design I want to use just once, I use Glad Press & Seal. I trace the design onto the plastic with a sharpie fine marker. Wait for the sharpie to dry and then press it on to the quilt sandwich. I machine quilt through the plastic and when finished, I pull off the plastic. I do use tweezers for densly quilted areas. I also try to match the thread colour to the sharpie in case of colour transfer.