I didn't find it all so intense once we had a schedule in mind. Just do one thing, then the next. Stay aware of deadlines.
I think junior year for my son was pretty concentrated, but not so much in senior year. One thing about applying ED is that if you're successful, that's it. You're done.
I enjoyed supporting my kids through that whole process.
INFJ, here... but with strong T battling it out with the F.