IMO, you need to be very careful when dealing with estate agents abroad. I don't think it's advisable to give them any information prior to viewings i.e. what your budget is, your financial position etc
Second this. A couple of years ago we were in the market for buying in France and we knew where we wanted to buy. We went around the local estate agents looking at various property details. One of the first things agents will do is see what property range you are interested in and from then on, miraculously, every property you are shown will be in that range. As in Ireland, in France you can haggle on price. Our experience would be that prices can come down by up to 10% at least. Also something to bear in mind is that if you feel you have judged the market and have a particular property in mind, you can make an offer to the agent telling them that this sum will have to include agents and notaires fees. The fees are negotiable too and agents can reduce their fees to catch a sale. Properties for sale by notaires are well worth a look, I doubt if any are being sold cheaply because of the lack of an agent, but certainly you can purchase without the additional agents fees.