We are self taught. Its not that bad/hard just dont be forceful with the probe. It will slide in gently, and then it will stop. When it stops, dont force it any further. If your not use to doing it, it is almost a must to have someone else hold the animal. Im not sure that you can really learn anything more from someone teaching you in person (other that confirming the sex). After all, you wont know anything more than what videos/ tutorials, or someone else can teach you until you do it yourself.
spooky