I'd say if you stick with hand signals you'll do fine. It's a natural motion, it's familiar to other road users, and it's cheap.
I find that the more you can reduce extra equipment on your commute the more pleasant your experience will be. Just sticking with basic gear in winter can already be a chore, never mind additional items that need batteries.
Having said that, if you do happen to be buying a pair a gloves then a bright colour, or a pair with reflective elements, would be a benefit. A high vis windbreaker will also make both you and your arm positions more visible.
And enjoy it, Limerick's not a bad spot for the old cycle commuting.