Ok here is what you should do imo. 1. Find a local breeder. 2. Have them show you how to pop your snake. 3. Practice with them to master it. 4. Well there is no 4 but I have OCD.

Don't judge by the spurs, tail length, thichness, anything like that. I have females that would pass as males and males that would pass as females under those "guidelines" The only way to be sure is to probe or pop and doing either of those methods wrong can injure the animal.