I'm a bit confused about the pronunciation of ř. In this clip it sounded like 'dj' or a soft 'j' in English (the way we tend to say 'Dvořak' in English, whether rightly or wrongly), but in other clips it sounds to me more like a tapped or trilled 'r'. Is there a rule, or is it just a matter of context or custom?
If "palatalised R" is what I could imagine that could mean it will be much better to just start with the rž sequence. But, to be sure, please point to some actual IPA sound you have in mind (https://en.wikipedia.org/wiki/International_Phonetic_Alphabet_chart http://www.ipachart.com/ and so on).