Its pretty hassel free, but u get what u pay for. Also before buying the car check what the VRT is on it first. The Irsih goverment sometimes likes to give a sly right hook to the jaw to people who import there cars.
Basically with IBC u you have to put 750 euro into there Bank Account first if u want to make a bid or put a offer on a car. This is to insure there not getting bogus bids. Also you will get your money back if you change your mind.
Then once you've bought your car they ship it over on the next boat (think shiping is 600 euro its sometimes in the price, well mine was). It usually takes 6-8 weeks to get here. Then you need to get a (cant remember what there called) a dealer to handle the import fee's, i used Avant Shipping, you could do it ur self but it only cost 50 euro for these guys to handle the paper work. You pay the shipping company 100 euro to take the car off the boat then they will give you release papers.
Once you have these you can go collect your car...
Now heres where the Tax's come into play.
1st fee is the 10% Import fee (i think) which is 10% of what u payed for you car.
2nd is the 21% tax (cant remember what for) which is added to the value of the car plus the 10% which was added.
Once uve payed these the car is released to you with no plates, they will give you forms so you can register your car the same day.
Basically i payed 4500 for my scooby off there, which included the shipping. So that got me has far has Dublin docks.
After all the fees the Car cost me 8500 in total.
Hope that helps.