Travelling!

So me and my husband and baby are planning to take a 3 hour plane ride in March. Little one will be about 14 months old and I’m terrified about it. I’m so nervous about her freaking out the whole flight, getting through security and all that. My daughter is a good girl but I’m nervous about my daughter disturbing someone especially if someone is sitting in the row with us. And she’s very high energy baby she’s already running all over the house. She’s a good girl but I’m nervous. Any experience from anyone? I want to make the experience as smooth as possible. I don’t think we’d buy a seat for her just to save money. So she would be on our laps.