Hi Phil,
No need for lawyer, Natario does all. Check the deeds to see if the ruins have been put on before paying extra money! Ask for a copy by mail if need be. If you have a bank account here in Spain, leave at least 10% of the purchase cost in the account and give the account number to the notario and he or she will have it taken out and they will notify you when they have done through the bank, This is normal and safe! You can pay all in cash to the owner on the day, as cheques cost money to have made up. Hope this has helped!
Caz....