I like things to be neat, so I clip threads as I go. When making the top this is not difficult because I chain piece to save thread and all that clipped bunch of threads. When I do the quilting I always start by pulling up the bobbin thread. I always tie knots and bury the threads after threading them through a needle. When I stop a line of stitching I immediately pull that thread to the back and bury it. Thus, some threads get buried to the front along seam lines and some are buried from the back along the quilting lines. Doing this task as I go along keeps me sane and undaunted!