I'm going to do something today that I've never done before.

Try to guess. If you begin with "I hope it's..." I predict somebody will get it quickly.

IN THE COMMENTS: The second commenter, Rockeye said:

Going shooting. A boy can hope.

That's the answer. I shot a gun!

I had 2 hours of training and practice at shooting range.

AND: Here's my new post with video.