I wouldn't trust a pet store. I think that you should do it yourself. Maybe have your BF hold still the head end. I have had a few try to bite, but rarely, and I haven't had any poop or musk.
It is easier to get the probe in by spinning it as you are using gentle pressure to get it in. As you move forward very gently, you will feel a definite bottom or dead end.
I've had nearly 100% success in sexing babies by using the "thumb roll" method. You hold the snake firmly between your thumb and forefinger, belly up, just north of the cloacha with your thumb on the belly side. Use gentle but firm constant pressure as you run your grip towards the tip of the snakes tail. The pressure pushes the blood further down into the hemipenes and when your thumb reaches the end of the blood filled hemipenes, it feels like small bb's going under your thumb. It's hard to describe, so I hope that made some sense.
Good luck, April!

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