Adults ASD Test

Hi im recently new to this site im 53 and after diagnosis of emotionally unstable personality disorder and severe OCD as well as being on anti psychotic meds ( 15mg olanzapine ) for nearly 2 ys now my new social care worker said he was sure i was autistic or aspie and started the process for an evaluation / test ive been waiting some 4 mths and understand it could be another 8 to 14 mths wait to be seen my question in all this is what to expect i really hate the unknown appointments etc give me a lot of stress anxiety etc if i don't know an exact date time and what to expect ive tried googling the ASD test but can find very little about it and was hoping someone could tell exactly what happens .. is it just 1 person ( not keen on too many people ) is it verbal questions or do you do a questionnaire ? sorry to be a pest but im really stressing out over this