If you have established that the type of pension policies you already have can be transferred (see note 3 above) and that it is what you want to do, it's not a difficult process. There's paperwork involved with setting up your new arrangement. Then a bit more paperwork involved in getting the transfers from your existing policies arranged. Your broker should hold your hand through the paperwork anyway.
Any good pension broker should be able to set up a self-directed pension for you, as Standard Life and Irish Life offer such arrangements and most brokers will have agencies with them. If you want a fully self-administered arrangement, you'll need a pensioneer trustee.