Advice on assessments

Hi,

I'm 42 and recently realised I am autistic as well as ADHD (known since childhood about 11) and am waiting on an assessment through right to choose and someone called Clinical Partners I think? I'm good and life is much better in the sense I know about why i've experienced life like I did etc. But I am a bit nervous about the assessment which hopefully should be next year at some point. Does anyone have any good advice for me with what to expect, what I should do to prepare and what the process is like? Oh and its an adult autism assessment in case that wasn't clear :-)

Many thanks

A