I can attune to an item OR un-attune to an item on a short rest, not both, correct?

Also, figuring out how an item works take a short rest as well.

I can't attune to an item or de-attune to an item on a long rest.

Therefore if I'm a pc with 3 attunements and i find an item that is not a potion or a scroll.

1. Just by handling the item I can tell it is magical.
2. I take a short rest to figure out what the item does.
3. I take another short rest to de-attune from an item.
4. I take a third short rest to attune to the item.

Is this RAW?