Hello from dfw area. Need help sexing bp

[elbee]

Hi friends, I live in the Mckinney area in North Texas and I was hoping someone with experience in the area would be willing to help me learn to sex my snakes. I have 4 ball pythons, three of which are males from known breeders. I got a normal "Female" ball python pos het albino on Craigslist a few months ago. Super friendly snake that I love but I am doubting its gender. I attempted to pop it but I am afraid of hurting it. I got a whitish sticky substance to come out of the cloaca, which makes me think sperm plug. I will be very sad if it's a boy, but such is life and such are CL buys. Does anyone have a probe kit that could show me how to use it if I purchased probes? The snake in question is over 1100g and I am sure probing would be my best bet. I also plan to breed in the next few years and would like to know how to sex hatchlings. So your help is much appreciated if you have any ideas for me. Thank you!