Bite off more than you can chew

Example 1: 

Christina: What's wrong?​ You look so stressed out​!

Adam: I am. I have 4 homework assignments tonight, a math test tomorrow, and I have to memorize my lines for the school play this weekend. Plus, I told my neighbor I would help her paint her house tomorrow!

Christina: Wow, that is too much! I think you bit off more than you can chew. 

Adam: You're right. I shouldn't have accepted so much responsibility, there's no way that I can do it all by myself.

 

Example 2:

Chase: How is your new job?

Austin: It's OK, but I'm a little bit nervous. Today was my first day, and my boss already assigned me 3 important projects. 

Chase: Wow, does he know that you don't have any experience?

Austin: I was afraid to tell her because I wanted to impress her. I think I may have bitten off more than I can chew. 

Chase: Maybe you can ask one of your coworkers for help so you don't have to do all the work by yourself!

Meaning: To try to do more than you are able to do; To try to do something that is too difficult for you.

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