I was taught to pin at the intersection, very carefully, making sure that the pin goes easily through the intersection (of course the seams are nested first) then pin the opposite seams also and then sew very, very slowly and you can sew over the pins and that will usually do it for me. Cutting is huge tho' and if your aren't accurate with your cutting everything goes off!!! I also got a charm pack that wasn't cut correctly and really made a mess of my quilt!!