Basically, there are 3 professional services that you need.
A good agent or agents to help you find your dream property. On the whole, most agents are pretty responsive and helpful.
– should give you good advice areas, not just the properties. There quite a few recommended Agents on Overseas Property Forum or just ask them
An independent property / visa lawyer who will work only in your interests, including help on navigating the visa application process
– make sure the plot or building dimensions are not exaggerated, check for financing on the property, rights of access etc and make sure the multitude of other possible risks are checked before you part with any money. I used RSA-LP who were great.
Finally, a currency transfer specialist. They will help you get more euros for your money and ensure your property costs are protected.
– Currency people will make sure there are no nasty surprises, like having to find another £5,000 when you need to pay the balance for your property
Best of luck.