There is an order to be efficient but the steps can be done over days or weeks. You will just need to rewash it before continuing to prepare for the next step. You will not need to reclay etc. once it is done.
For example, you could wash, clay/iron x, etc. then stop. Then next time wash, paint cleaning or correction (a few panels at a time), then stop and continue by washing, polishing, etc. A rinseless or even waterless wash process may work if just driven one day without rain. etc.
This is what I meant in the earlier post.