你可以说 "It's not that difficult." 或者 "It's not as difficult as you might think."

这个表达来自于英语中常用的口语表达方式。

一些英文例句和中文翻译如下:

"Learning a new language is not that difficult." (学习一门新语言并不那么困难。)
"Making a cake is not as difficult as you might think." (做蛋糕并不像你想的那么困难。)
"Solving this math problem is not that difficult." (解决这道数学题并不那么困难。)

希望这些例句能帮到你。