Easy is never the proper term to use when it comes to randomness. Maybe if you're rerolling accounts since you can just ignore failures, but for others, that's... not quite how it goes.
As a rough estimate, 3.000 Jewels get you about 8% chance. If you want a coinflip, then 24.000 Jewels. 75% chance isn't broken until 57.000 Jewels. So yeah, good luck with that.
It gets worse, though. Since gacha games are made to be scams, if you don't get a Hime while the Rate Up is in effect, you effectively never will. Reaching coinflip takes 138.000 Jewels, and keeps getting worse as more and more SR Hime are added to the pool. But hey, maybe you'll get her from the second anniversary SR Miracle Ticket?
Oh, and those numbers are assuming that we're still running the same old 5x modifier. DMM was running 15x at this point, but I don't think Nutaku has followed suite. If 15x is in effect, then your chances are significantly higher.