You will also need to be out on a moonless night under skies with no city light pollution. Trying to see Pluto with your scope from the city, or trying to see it under a bright moon, is an exercise in futility.
Pluto is never more than a dim speck looking like a faint star--so faint, you'll barely see it, except with practice under dark skies, using the techniques Bob Sal describes in his post.