I have been to an inquest as the mother of the deceased. Sadly, my husband, father to the deceased, had also died after the first death. He should have been a primary witness as he had been there but all that could be done was to read out his statement.
The court staff and the coroner herself were magnificently kind and supportive. Possibly more than they would have been normally due to my personal circumstances. Surviving sibling felt less positive as their baby was not allowed in court. We were offered the choice of being in a less formal room or the formal court set up. We went for less formal and felt it was the right decision. It was a large room in the council building with a table at the top for the coroner and some other officials - my memory is a bit blank. Witnesses were called. They sat amongst the rest of us family and friends before going up to speak.
We were given opportunities to question every witness and the coroner would repeatedly ask if we had anything else to ask. Only family could ask questions but I could take notes from others to ask.
There were two serious incident reports made from two NHS Trusts and maybe if we'd pushed for legal representation then something could have been made of malpractice or an incompetent release procedure. At the time I just wanted to make sure that nothing like this happened after anyone else's release from being an involuntary patient for mental health reasons - being released from one trust into an area not covered by that trust.
Something helpful was that friends of my child had questions for the first trust - a lot. Their representative stayed behind to talk to us and they felt heard and understood more about what had happened.
We were offered a CD of the two days proceedings at the start. I have never listened to it. We could pay there and then for extra copies.
When it was over we went downstairs and got a proper death certificate from the Registry Office that was in the same building.
Timing - it took some months to set up from the original death then that hearing had to be postponed as my husband was in hospital. The hearing was eventually held over a year after the death.
OP, I'm sorry you have to go through this, and sorry for your loss. The only advice I can think of is to take notes to jot down questions that may arise from evidence given. Write down questions you have already. Make sure you have support from family and friends. If the court is in another area plan in advance about travelling and where you will stay.