I hate pins. They're dangerous.
I actually have a lucite template I bought somewhere (here's a similar one from Judy Martin
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this is for a 45degree angle but they also make one for 60 degrees) When I'm piecing diamonds (if I've speed cut them from a strip of fabric), I always stack them up - around 8 - and line the template up and chop off the offending point. It's those dog ears that make it difficult. This way, the pieces not fit together perfectly, there is no need for pinning, and the sewing them together is a breeze. And you're not handling those sneaky bias edges for too long because there is not need to adjust a little here, and pull a little there.
See how the corners of the template are shaped? That allows you to match EXACTLY without having to adjust for the extra material in the dog ears (because it ain't there). If you have EQ, you can print out the rotary templates for any star or block (again, diamond size doesn't matter) that has the degree angle you're working on, and it will have those blunt edges.
This extra step takes WAY less time than pinning.
Hope that helps.
-Michele in NYC