It is quite a complex process and you need to go to about 6 different offices including, police for fingerprints, court for certificate for no criminal record, hospital to get report from 2 or 3 doctors depending on your age, tax office and traffic police. You also need a translated and notarised copy of your current licence. All this can be done in one day if you have a good run.
My wife (who is Turkish and so knows how the rules work) does offer a service to assist people and make things a little bit more painless. If this is of interest to you please contact me.