Chandelles: Full power, 30-degree bank, and pitching back until the 90-degree point, then you maintain your pitch angle as you slowly let out bank to complete the 180-degree turn. You should hear the stall horn at the end.
Eights-On-Pylons: Basically the name of the game is keep your "pylon" fixed. If it moves forward, pitch forward. If it moves back, pitch back.
Lazy Eights: I heard a CFI teach it as, "Make it so lazy I don't even know you started the maneuver." You should climb about 300 feet in the maneuver before descending back to your original altitude and airspeed.
UND Aerospace has some great videos on the maneuvers on YouTube, and they make the maneuvers crystal clear. However, nothing will substitute actually performing the maneuvers in the airplane, and you will never fully "get it" until you do it.