If my breeding plans work this year, I'm hopefully going to have a lot of baby snakes that need to be definitively sexed. The problem is I have no idea how to do this safely.
I do have access to a good herp vet, but the downside is I don't believe they have a lot of experience with garters specifically. They've treated my snakes in the past though, and they're trustworthy.
I'm pretty good at tail-shape sexing (got both of my blacknecks correct last year!) but I feel like that's not what people want to base a purchase off of.

So how do you guys sex litters before selling them, and where did you learn to do it safely?