Autism assessment

Hi, I think I may be on the autistic spectrum. I am going through the process of being assessed. I had a questionnaire and GP referral. I had my first assessment and there was a form someone who knows me had to fill out which was sent away. I was told I would need another assessment with someone who knows me but it has been 8 months since I have heard anything back from them which is causing me anxiety. I was thinking about calling them but they may not be able to give me any update and I don't want to be a hassle. This is all new to me and I don't know what is the normal time to wait on the NHS for a second appointment. I was just wondering if anybody else could share their experiences.