You will either need to visit the notary in Italy to attend completion, or arrange for a Power of Attorney (usually your lawyer) for completion and transfer of ownership of the property (Rogito).
At this point you must pay a property registration fee and a land registry tax plus the remaining balance of the agreed purchase price. Then both vendor and purchaser sign the il rogito notarile, the definitive contract equivalent to the Deeds of the property. All registered property transactions in Italy must take place in front of a notaio. The notaio’s job is to check that the sale documents are correct, to verify the identities of the parties involved, to collect the tax on the sale due to the Italian government and to ensure that the entries in the land registry are updated to show the new owner.