Can't wait to see the whole quilt. It is going to be beautiful. I used a hint from someone on here and tacked (with thread) the corners on my latest project and it came out perfect. I tried the three pin method but I hate dealing with pins when I'm sewing. If you tack with thread then you can just sew right through. I also pinch my seams per Jenny Beyer's advice. Get them between your fingers so you can feel exactly where they meet. And, I use the "peek" method too.