However, it is heavily streamlined. My university medical center and on campus pharmacy had me in and out with a week supply of adderall in about two hours. There were weekly followups for about four weeks, then monthly followups every three months, and then it was just five mins with a psychiatrist for minor adjustments thereafter. After graduation, most psychiatrists will do monthly followups over the phone, and may only require you to come in a few times a year.
I have however heard it can be much harder if they suspect that you are unstable or "drug seeking". But if you don't appear to be a risk, and you can clearly explain your situation, then they will usually offer you a week supply and you report if it helps you. I think a big factor is just what your life situation is.
Private psychiatrists are much more likely to help you. Make an appointment with an "ADHD specialist". As long as you don't have any red flags, they are likely to give you a test prescription"
I'm not sure about my current provider, but the place that diagnosed me would let patients complete evaluations at a slower pace if they couldn't afford everything right away.
Also, before I switched to a specialist after moving, I tried asking my GP for my RX and they went straight to "pill seeking", however, they would still allow me to get my script if I came in every month for a drug test.
So the diagnosis process was mostly answering lots of questions and filling out some questionnaires.