It depends on the project-- I always baste along the top, then down the sides ( on the longarm) I don't that often SITD unless it is the quilting I plan to do. If using a domestic machine I would think that basting well before quilting is key to success. If you don't baste well before quilting SITD may be more necessary. I've never heard of anyone using wash away thread for SITD-- SITD is generally part of the intended quilting. I've only heard of wash away thread being used for trapunto