What can I expect a summer of selling to be like?

You can expect that the company you choose to work for will treat you with respect. There are rumors floating around that "the marketing companies don't care about their employees", "they don't care how many sales we make." That is simply not true. The only way the companies succeed is if their sales reps succeed. You can expect a lot of rejection, the majority of the doors you knock on will probably say "no", but look at the details of your pay-scale, usually it only takes 75 "yes-es" over a summer for you to be rewarded quite handsomely. You can expect hard work, and a fair amount of frustration, but if you work hard, strive to improve and master the skill of being upbeat. You will succeed in a summer of selling!