Being a witness in Crown Court: what do I need to know?

[ThreeBrokenOneGutted]

Some months ago, DD made a disclosure of historic rape. She was offered the option of giving video evidence and chose to do so. The CPS have gone ahead and charged him and the case has gone to Crown Court. The defendant has pleaded not guilty so the case will be going to trial.
Obviously DD is the main witness (she will be cross-examined by video link) but I'm also being called as a witness, possibly because she made the disclosure to me.

I know the conviction rate is low, but DD wants to pursue this in the justice system, so I am supporting her as much as I can.
I have had zero experience with the law and have never even been to a court. My impression is that being a witness can be quite intimidating, so I want to be as prepared as I can be.
From reading previous threads on here, I've found out the following:

• Dress conservatively / smartly
• Speak clearly
• Address the jury even though it's the barrister who is asking the questions

Is that information correct? Is there anything else I need to know or do when I am there?

I will probably duplicate this post in Chat, in order to get as much advice as possible.

That's all correct.

Try not to get angry when they cross examine you. You will probably feel enraged at some of the things they say to you but if you do, just take a deep breath, take your time and try and answer as calmly as possible. If you need a moment, take a sip of water to compose yourself. It gives you a few seconds of breathing space.

Take tissues in case you get upset, and don't forget to actually take them into the witness box with you rather than leaving the in your bag. If you do get teary, that's fine. The judg may ask you if you want a break but, unless your testimony is going to be spread over a full day, I'd just crack on and get it over with. Getting upset is human.

Good luck, and tell your DD that whatever the outcome, it absolutely does not change the facts of what happened to her. She is incredibly brave x

Thank you; I hadn't thought about having tissues with me.

All good advice, you may also wish to consider directing your response to the Judge rather than jury (it's perfectly acceptable to do so) as sometimes maintaining contact with one person may help you keep focused on your response rather than trying to address several people - its often human reaction to want to engage everyone you are speaking to which could be distracting.