"We know they are coming after revenge from the World Cup, so it will be a tough one," Dickinson told British media.
"They (Japan) are very skilful players. Minimise errors and start better (than the World Cup encounter). We need to tidy up a few of our fundamentals and need to come out of the box firing."
The 32-year-old, who has made 57 appearances for his country, also praised Japan's set piece game, adding that Scotland must be wary of complacency.
"Japan take their chances," Dickinson added. "The Japanese scrum probably the lowest in the world, they are a tough scrummaging team who will be coming for us. It will be a good challenge."
Japan host Scotland in Toyota on June 18 and in Tokyo a week later.
(Reporting by Nivedita Shankar in Bengaluru; Editing by John O'Brien)
