Some tips: i got unlimited saga today
TLDR is: use the GameFAQs system guides when confused, or some of the good YouTube tutorials if you prefer something visual. The manual doesn’t actually tell you a whole lot but someone’s posted it in that thread too.
Biggest tip: Press R3 to rest for a turn and restore some HP.
Since I just finished Trails in the Sky 2 I’ve been in the mood to try another RPG and have been considering playing Unlimited SaGa again myself.