Whoever said upthread it is a slow process is spot on - but that in itself is a good thing. A smooth process for many (ie no previous divorce to go through the separate C4 process for) is often 2 years from first meeting the DDO to starting training if successful.
At a first meeting, there is usually some fact finding - ime they want to know about you, who you are, your faith journey, why you're here and exploring a call to ordained ministry. They are listening to you and to God, to sense whether this is the right thing.
In this diocese, you are often sent to see a vocations person next for a few meetings over several months, to discover more, get you to read or write maybe, think about a particular aspect of ministry. That may be different where you are.
It also helped me to remember that the DDO was responsible for people at this early stage, right through the discernment process, BAP, follow up and college, plus arranging curacies and ordination arranging - and all the regular diocesan stuf, working with parishes, national networks. Although it can feel that you're not important, you are a piece of a bigger jigsaw and as you progress through that becomes clearer.