The easiest way to be good at HR is to be good at nomod first. Playing HR should come naturally if your nomod acc is consistently around 99%. The main element of difficulty when first learning HR comes from the high AR, which makes it easy to hit late or miss at first (and then fail because the HP drain is so darn high). I ended up going with HDHR because it's much easier on the eyes. And of course, anyone will fail a lot when starting out with HR. Don't be afraid to play with NF on until you can consistently pass stuff with HR.
Now about the specifics: I personally don't think it's a good idea to learn HR at your rank. It messes up your reading and encourages whack-a-mole gameplay at lower ARs. I personally started really going for HR around rank 90k, and even now I think that was a bit too early. I've got nothing against people who wanna do it anyway though. The best way to learn HR is to first play on maps you've already FCed, preferably 0.5 - 1 stars below your usual nomod level. If you're already familiar with the patterns and rhythms, you can focus more on reading the high AR, then later you can try playing new stuff with HR.
