What has been your hardest struggle as an affiliate??

What has been your hardest struggle as an affiliate and what would you do to overcome this?
For me Selling is the first challenge. Selling products is not easy because it is very competitive.
i have to offer discounts and also offer credit to conquer the market.

And for you ? What has been your hardest struggle as an affiliate and what would you do to overcome this?

https://www.tripleclicks.com/20682005