Mistake people often make is putting a link in, looking at signups and if they aren't profitable in a day or two they pull the campaign.
I have been an affiliate for 15 years and sometimes the best offers take time to hit. There are 3 programs I have been a top affiliate for and in all those cases I wanted to pull the plug within days but they ultimately gained ground and are profitable.
But -- yes -- not knowing what you're doing will sometimes end in tears. Its wise to review results and data after a few days to see what changes can be made based on intelligent decision making.
Many campaigns are doing better at JuicyAds now with the new SexyTechnology running to help optimize

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Jay | JuicyAds Founder
Businessman of the Year [YNOT Awards 2013]

The most awarded adult advertising network with 25+ XBIZ, GFY, and YNOT Awards.