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B&B's are worth booking early, they will tend to get booked up fairly quickly. I'd suggest looking at the "visit Scotland" website. They should be able to help with booking B&B's
In general the mobile coverage was nothing better than ok. It can be a bit sketchy in the towns, but I think it is getting better.
Rain - this is Scotland, anything can happen
Best starting point - There is no Official start, although I think the on-line guide starts at Kelso and follows the route clockwise. If you are traveling down from Edinburgh I would suggest Melrose as a good starting place, but that is just personal preference.
For the most part the Way is on pretty decent surfaces, so there shouldn't be too much opportunity to turn an ankle. It is worth taking gaiters though!