1) use the imperative form, i.e. do this, do that, don't do this, etc. Sometimes we were given flow charts with the -ing form and we had to remember to change this.
2) use linking words, e.g. first, secondly, then, next, after that, finally.
We always divided these essays into 3 paragraphs: introduction (c. 20-30 words), main paragraph (c. 90-100 words) and conclusion (c. 20-30 words); total: 150-160 words.
We did several practice procedures before the first writing assignment and first progress test.