Sherry when you get to the place where you want to end your stitching, just take several tiny stitches to lock the end of the seam then raise your needle and slide that area of the quilt about 9" away from the needle. Use your left hand to hold the top thread to the left and slide the stopping point back to the needle.
Drop your needle down, then back up to bring the bobbin thread back up and holding both the top thread and the bobbin thread move the work about 5" from the needle.
You can now cut all the threads from the top, right above the last tiny stitch.
Reading all that makes it sound difficult. If you will watch Linda Taylor's long arm demo, it will make more sense! She does it several times in this video:
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