Depends which country your in and which authority your license is going to be with.
And as much as everyone thinks JAR is all the same there are quite a few differences country to country.
If you did your hour building in the UK with a JAR license there wouldn't be any probs with you rocking up and having a check flight then hiring a plane as much as you like.
Again in the UK FTO's just check that you have the required pre course requirments which are usually only hours based eg 150 hrs TT etc etc.