The watermark is only applied if something is printed directly from Fade In: export and print somewhere else and there should be no watermark. As for the formatting, I don’t recall - but I do know, that everything is configurable; so you can make the formatting the same, if it differs
Do it! It’s a fantastic science, with ever expanding horizons! That being said, if working in the field is a bit too much, amateur astronomy is a fabulous and friendly hobby - if a bit expensive