Just to add my twopennyworth. It seems to me that, to a certain extent it may depend on what you think of as reasonably priced. A frenchman local to me charges 15€/hour. An englishman local to me charges 12,50€/hour on the cheque emploi scheme, so I imgine that the employer (you) would end up paying 15€ or more by the time you've added in the insurance. I believe that the minimum wage is about 9-10€, but on top of that employers would have to pay insurance etc. Are these sorts of figures greatly out of line with what you have been quoted? If not, maybe you would think about going with one of the people you have found. Don't forget that (I imagine) they will supply all the equipment (mowers etc) and transport them to your home.
Other than asking around (already suggested), the only other suggestion I have is that if there are any shops local to you that have small-adds posted somewhere in them, you could study those. My local Intermarche has them, as does a small Briconautes. Also make sure you know the key words for what you want to have done, eg tonder=to mow etc. My french is pretty bad, but I've usually found that if I get the key words in there somehow, I can eventually make myself understood.
Thank you Patrick, for me the hardest part is knowing what is being said to me, I can prepare some words in advance and read them out but when they respond, they talk really fast and I get so frazzled! I cannot understand spoken French, even the words I know get thrown together and lost to me, plus I have a hearing problem to make it worse. I wish I had exposure to the French language over my lifetime but only Spanish.
I have seen several ads for gardening help as I said previously but this phone thing is scary for me.
I was quoted 180 euros per day of work by the English people that I talked to and it will take about 3 days per their estimate, and that's more than we can pay at this time. Maybe that is normal here but just not in our budget.