Turns out it's not so bad. The Complete Serger Handbook by Chris James offered several alternatives for an outside corner but only one for an inside. "Inside corners are a bit more challenging than outside corners," she states. I think perhaps this is true for woven fabrics; her pictured example is with a woven fabric. With the natural stretch of a knit, it's not difficult at all. Here's my take on it:
The Inside Corner
Step 1. Serge along the first side of the angle. Stop when the knife reaches the vertex of the angle.
(This odd shaped sample is my Crazy Crushed Can Accessory. You can get the free pattern by signing up for my Cut & Sew Chronicles newsletter coming mid December.)
Yes, a straight line! It will look something like the picture below.
Step 3. Continue serging. When it's finished, it looks like this.
It only takes a little practice. It's just that easy!
Next up: Serging outside corners.
The Complete Serger Handbook by Chris James