I know you hesitate

I know this is a lot to take in, so do not hesitate to contact me on the details as you apply these approaches.

我知道这其中有很多方面的内容需要理解，所以当您应用这些方法时，遇到相关细节问题不要嫌麻烦，尽管与我联系。

If you want to know more about me, please do not hesitate to drop me a line and I shall reply to you soon.

如果你想知道更多关于我，请不要犹豫，请给我一条线，我会回答你尽快。

If I change my mind, and it doesn't work for you, please don't hesitate to let me know.

如果我改变心意，而造成你的不便的话，请务必要让我知道。