Hi Rob,
I know of at least two others who never had much French. Janet found the tourist offices were very helpful with booking gites etc. A South African woman I met carried a mobile phone with her Miam Miam Dodo, and would point to entries she was interested in, and fellow French pilgrims would willingly ring ahead for her. I found there was quite a 'community' feel on the Le Puy route, and the French speakers all looked after me.
One thing you might want to be aware of starting on the 8th: it is a Public Holiday (1945 Victory Day), as is Thursday 13th (Ascension Day). Public Holidays in France tend to turn into Long Weekends, with more people in the outdoors, and food shops closed when you might not be expecting. It doesn't mean that you should avoid starting then, but it just means you need to think about booking gites ahead/buying food etc a bit more around this time.
Margaret