
Ooh good luck! I have horses and I recently went to a camp where we rode for about 3 hours every day and by the last day I was in so much pain. Give yourself a good stretch before and after riding concentrate on the inside of your legs and in your groin - make sure you stretch them out. You can buy sheepskin saddle covers - I wouldnt use it for the first 3 days but you might get a bit of comfort 3 day after??
Make sure you take lots of piccies!!