If you have put in good training rides (up to 75 miles or so) you should be fine. 10 hours may seem scary but it is pretty generous. 5 miles before each rest stop, start making a mental checklist of what you need to do, so that you go in with a plan: check tire air, fill bottles, potty - whatever it is you need to do. Keep repeating the list to yourself as you near the rest stop so you don't forget anything and can be as efficient as possible.
When it seems easy, ride hard. When it starts to feel hard or tough, ride easy.
On the stem/scapula issue - that is something you may want to get checked AFTER your century. It may be a bit uncomfortable, and perhaps your fit should be adjusted, but it's a good rule of thumb not to change anything significant like that right before a big ride.





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