Each monster's battle position can only be changed manually once per turn.
If a monster has been Summoned, Normal Set, or declared an attack, you cannot after that change its battle position manually during the same turn (even if the attack was negated or cancelled due to a replay).
You cannot change monsters to face-down Attack Position whether manually or by a card effect.[note] Face-down Defense Position monsters are always flipped when changed to Attack Position. This change is called a Flip Summon when it's done manually.
Card effects that prevent monsters from changing battle positions only prevent them from changing their battle positions manually, but can still be affected by other card effects that change their battle positions. The only exception is "Raging Cloudian".