It's funny, but I never really had to learn to count rounds, because ever since I learned to count as a boy, I developed the strange subconscious habit of counting practically everything. I don't know why, exactly, but I'm just one of those extremely perceptive people who makes mental notes of little things, even when they're of no particular importance.
Folks used to say that I think like a detective, but I think that's giving me a bit too much credit, because although I do have something of a knack for picking up on things that escape the notice of others, it's honestly more of curse than a blessing if you ask me. Honestly, I drive myself crazy during downtime, practically counting down the seconds until I had something to occupy my time because unless I'm tired I can't really relax, yet at the same time I'm anxious when I get extremely busy or have a lot of things to do. Everything becomes that much harder when you're always adding it all up then counting it all down.
However, I have a weird habit of doubting what I count, so I often end up second-guessing myself, thinking; "Wait, did I miss one there?" So eventhough I count my rounds as I'm shooting them, I end up questioning whether I actually counted them correctly. I do the same thing when I lift weights too.