Um, I put a penis into my mouth. LOL!
No, My Man guided me. I bit him one of the first times I gave him head. I felt really badly about it. I gained confidence as his satisfaction grew. He loves getting head, and I love giving it. He's also a Master at cunnilingus, so it balances nicely.
I never "practiced" on anything other than a real man. I never had a dildo or used a shampoo bottle or any of the things you hear about. Just got experience when I could, which was often.