To get to over under #1 = shoot a double leg (L2 + Hold Triangle/Square for Southpaw) then press R2 while your fighter has grabbed your opponent's legs
To get to over under #2 = slip to the inside of any straight punch (Jab/Straight) and initiate the clinch (R1 + Square/Triangle for Southpaw)
To takedown your opponent with a inside trip = move the left anolog stick towards the opponent (left or right) + R1 + Circle (Cross for Southpaw)
To takedown your opponent with a outside trip = R1 + Circle (Cross for Southpaw)
To pull guard your opponent = R1 + Square (Triangle for Southpaw)
To pull guard and sweep your opponent = R1 + Triangle (Square for Southpaw)