My suggestions: compartmentalize setting up the work environment - here: put notes on table, open file, etc. - and the actual work. Basically you set up everything you need, then get a tea and then start work. That way the setup is not perceived as real work.

I strongly support this suggestion. The setup phase can be generalized as removing trivial inconveniences and creating trivial impetuses. I often separate this stage from the actual work, sometimes with an explicit commitment not to work before the setup is done.