The Aviva young driver scheme is very good, you pay for the compulsory lessons upfront and get 6 months free accompanied cover for your learner driver, ensure they are always accompanied. It got my son motoring at a reasonable price, in our case we bought a 2nd car for less than €1000, registered it in his mums name and had him as a named driver, mum is also insured with Aviva so they know she is the registered owner of two cars and can use either one she wishes.
We did use another local instructor for two pre tests which were invaluable, the Son now has his full licence, it worked well for us, as reasonable as it could be but still about €800 or thereabouts when you factor in licence, lessons, and so on but not the car, that was the cost assuming they get their test first time.