Hi
@K-dor,
Yes I would recommend you book in St Jean, September is very busy, not all of the pilgrims going are on this forum, there will be many more and you will have peace of mind. See my avatar? That was where I stayed my first night, changed hands now. I was Sooo excited! If you want to stay in Orisson you must book as the number of places are restricted.
Last time I did get my Credencial in St Jean at the Pilgrim's office but this time I have already purchased one from Ivar on this forum and its lovely. Personal preference really.
If you don't have a poncho that covers your backpack you could get one in St Jean at the shop just down from the pilgrim office and if you want a simple lightweight wooden pole there are several shops where you can buy.
Most of your stuff should be tried and tested before you go, pack your bag, weigh it and start training with your bag now! For Packing Tips etc I can recommend our own
@S Y Yates book by the same name.
Sunscreen and hat with a peak are essential for me, but the most important thing of all is that your shoes and socks are as comfortable as they can possibly be. I took boots the first time, too hot, my feet swelled after 8 days and then the blisters came, not many but painful nonetheless. I like thin socks, woolen don't work for me, I'm more a sports/running sock fan.
I had the most amazing time on the camino, you will love it. Everyone helps each other and they even show genuine loving care to anyone who needs it. This is why I'm drawn back a third time and quite possibly will always spend sometime on the camino every year? I look forward to retiring when I can do the whole thing in a 'oner'.
Please don't hesitate to ask if you have more questions, I'd be pleased to answer them if I can.
Buen Camino!
Sarah