I would suggest maybe doing the withdraws in 2 or 3 different amounts. Also maybe do them once one clears and is in your bank then do the next and so on.
There will be some to suggest all at once, it just depends, everyone has their own methods.
just like MM78 says! also do not try to withdraw before the item is delievered, this can be seen as 'shady'. i usually give it a few days after delivery then i start the small withdrawals