Hi Roger,
To start off, the best advice I could give you is don't rush and stay calm.
Unlike me, I get overly excited whenever I see the ISS and I almost always forget to do something.
In my most recent attempt at imaging the ISS I was in a total rush. I had less than 25 minutes to setup and I almost forgot to start the camera and focus the scope.
Anyway, if you are going to manually track the ISS, I suggest you accurately align you finderscope so you have the best chance of capturing the ISS. A fast shutter speed might help to freeze the ISS on frame and the rest is up to you.
Good luck.
