You dont need to read it all, just read a bit and work on one or two things.

Here are some chapters from How to Win Friends and Influence People by Dale Carnegie:

Become genuinely interested in other people
This chapter discusses how becoming genuinely interested in others can help you make more friends in a shorter amount of time.

Make the other person feel important
This chapter discusses how making others feel important can be done sincerely.

Get them saying yes
This chapter discusses how focusing on the things you agree on with others can help them nod and agree with you.

Make a good first impression
This chapter discusses how smiling is a simple way to make a good first impression