I'm not much further ahead than you are, but I discovered something that really helped with my second quilt... When you're pinning the rows together, try to match up the corners with pins, and then go back through to add more pins in between. Unless your squares are WAY off, this should work fine without a lot of wrinkles. The corners of my second quilt all match up, and it looks much better... but I'm still proud of the first one!
(Experienced quilters, please correct me if I'm wrong. I don't want my ignorance to cause problems for Krysti.)