Hi there i recently orderd my pc and its in pre-preductionand i orderd a mouse with it but i no longer want it and im thinking of amending my order. If i do so will it hold it up or cause complications
You won't cause any complications by removing a mouse. You'd cause a hold-up if you were amending your order by adding something that was out of stock, but taking away a mouse should be perfectly fine.
I amended my order twice, second was on phone but both changes were made to the order right away.