Under-construction projects in Sector 119 are a gamble

Sector 119 mein ek project dekh raha hoon, ABA Corp ka. First-time buyer hoon, honestly, hidden costs ka idea hi nahi tha. Property price toh pata hai, but stamp duty, registration, interiors, yeh sab mila ke kitna upar jaata hai? My budget is tight. Parents bolte hain under-construction mat lo, delivery risk hota hai. Kaise pata chale builder time pe dega ya nahi? Koi experience share kar sakta hai? Kya dekhna chahiye agreement mein delivery clauses ke liye? Ab samajh nahi aa raha.