My own property search: insider's dilemma

Been in real estate for a decade, but buying my own flat feels different. I know all the marketing spin, but for my own money, I'm super cautious. Salarpuria Sattva's Lake Ridge in Narsingi looks good on paper. But how do you guys verify the RERA registration ka actual status? Matlab, is it just a formality ya serious checks bhi hote hain? Aur title verification ke liye, kya documents dekhne chahiye jo log often miss karte hain? My lawyer bol raha hai encumbrance certificate aur OC bahut crucial hain. RERA complaints work bhi karte hain ya bas paper pe hain?