been there, done that, too, Izy. :lol:
i don't like the lumps i get when i try the lockstitch method. i assume i'm doing something wrong, but i gave up on it.
when i'm being lazy, i backstitch to finish. sometimes it's invisible, sometimes not. when i'm being more careful, i pull the bobbin thread up to the top using the method Izy described. but when i'm being a really "good girl", i pull both threads through to the back of the quilt when i'm done, tie the tight tiny knots and then "bury" the threads with a hand needle.
psssssssssst ... don't tell anybody, but i've been known to use clear fabric glue, too, when i'm desperate. :lol: