Welcome to the Community! :)
It is great to hear that you are busy planning your upcoming visit to Ireland this coming October, as this will be a great opportunity to discover the many amazing attractions and places that Ireland has offer.
The October season will be the low season in terms of tourism numbers and I would say that finding accommodation would offer no major issues with your travel plans. I would however have a back up plan just in case a certain hotel or Bed & Breakfast may be fully booked on a certain day. Also be mindful that weekend periods are busier than weekdays and you may need to do a little research on availability.
Check out this great link for helping you find your prefect accommodation for your trip to Ireland. :) Tourism Ireland Accommodation Finder