Is it OK if I give the order details through Skype instead of Order Notes (at checkout)?

It’s always better to put it at Order Notes because often, the guys doing support won’t be processing orders as well. So if you provide the information on Skype instead of at checkout, you introduce a small delay until the order processing actually starts. Why? Because you create unneeded communication between us. You might also be unlucky and no one might see your message on Skype, while on order processing we always have at least two people available that receive alerts whenever a new payment has been confirmed.