“Good” is a subjective qualifier, but most people know when the work they produce is good or mediocre. Good work is doing one’s best. Mediocre is doing just enough to get by. Good work may receive criticism and need corrections. Mediocre work has to be completely redone.
The first word is hard. The second one is a little easier. The third? The third should be even easier, which is why I say to write it. Don’t worry about the first word too much. Just start. Let yourself reach the third word, then the fourth and fifth. Don’t spend a lot of time obsessing over the words. Just get them on the paper.