Don't overcomplicate things.
Don't do things with a progressive until you firmly understand how to operate a single stage press. (Dillon 550 is ok if you run it one station at a time.
Don't EVER buy a Dillon 650. Under any circumstances. For any price. You're welcome.
Don't try to reinvent...
It seems like everyone overcomplicates things these days.
My wife and our daughters have K-38s - both model 10s and 64s.
They all are very comfortable - and adept - with them. That's not an accident.