Rory: This book guarantees it will teach me how to meet girls.

Rory: Chapter one, just be yourself.

Rory: Let’s come back to that one.

词汇注释
guarantee vt.保证，担保。例句：
Will you guarantee us regular employment?
你愿意保证定期雇用我们吗?

be yourself 做你自己。例句：
You just have to be yourself.
你只需要做你自己就行了。

chapter n. 章

参考译文
Rory:这本书会教我如何遇到女孩。

Rory:第一章：做你自己。

Rory:我们还是谈谈如何遇到女孩吧。