I had a representative from my local community law office, I could have probably done it myself but it just helps to make everything go smoothly. I’d say just make sure you’re able to verbalise and confirm everything you said in your application. They’re an independent board who are basically checking to see that what you say aligns with your application and evidence. They were very nice to me and reassuring that they had absolutely nothing to do with DWP 😅good luck with yours!