Make sure your hair is detangled well.
Apply a light amount of product, and some anti-frizz serum or mousse.
Make sure the hair is flat on the roller. The best advice I've read is roll, pull, roll.
The way it looks on the roller while setting, is the way it'll look when its dry.
Keep the hair wet, especially the ends. Keep a spritz bottle close by.
Keep all the tools wet as well. Keep a cup or bowl near, to dip in the rollers or comb.
If you don't like to stay under the hood for too long, sit under for at least 20-30 mins. Then airdry, and come back to the dryer towards the end.