No reason why you can't, but it is a bit technical to get it right. There is prescribed wording (I think) for the affidivat and summons which you can probably get from the Probate Registry, otherwise you will need access to a professional text.
Try a local solicitor or counsel with direct access - it shouldn't be too expensive.
However, if you write to the solicitors beforehand and ask them to release the Will to the Probate Registry on notice to exec no 3, that might be a cheaper way of dealing with it. They don't have to do this, but might be worth asking.