Take your time.
Your buyer may not be hanging over the keyboard the way we sellers do.
If you don't get a 'yes or no' response by Sunday, bill him for the appropriate shipping cost. You can do this through Paypal's Send Money.
Don't forget the cost of packaging. And make sure the item is shipped with Delivery Confirmation/tracking.
If he does not pay, refund the original payment.
Then Block the bidder.
Now you can relist.
BTW, it is a Best Practice to take ONLY cash for pickup. The buyer can then inspect the product before paying you, so he knows what he is getting. And you don't pay PP fees.
PP demands that you be able to prove delivery electronically. For local pickup this is not feasible.
You manually mark the item paid and shipped in a local pickup.