Rachael...the tri isn't bad...go look closely at the pic of mine...I pp'd it by printing an extra copy of the "block", then I just cut it in a couple of sections, pp'd it...
On B7, I appliqued mine so I can't help you much on that one other than to suggest that you just cut the templates out. Others seem to be able to sew a curve much better than I can...I'm pretty sure you are one of them. The curve is pretty gentle...so I'd try that.