I love it.
Day-to-day is hard to say because it depends where you’re stationed and we have a pretty wide range of things we can do. Typically, we do our first tours at a large NSA site, then go to a ship/Fly in EP-3s/subs/NSW, then either go to NPS for a masters or possibly back to NSA to do a cyber tour. With that said, there’s no set path as a junior officer, which is nice compared to other communities.
I won’t begin to comment on chances of getting selected, not my bag. I’m sure it’s competitive, but I would use that as motivation to do well in school rather than not pursue it. You’ve got plenty of time to research the requirements and set yourself up; after 4 years if you still want to do it, go for it.