To primer, or not to primer

To primer, or not to primer

My husband and I are in the process of buying our first house. We close on 10/22 and will be moving in shortly after. The room that is going to be my office was previously the bedroom of a young girl. It is painted a pretty lavender color, however it doesn't work for me. Do I need to primer this purple before I paint over it? I want to paint it a light, warm orange color. I've never, ever, painted a room before, so I really don't know where to begin and what is necessary. Thanks for any advice! EDIT: Thank you to everyone for your recommendations. I will prime it, and I will post pics when it's all done. :)
Hello!

Hello!

Bread! With Pictures!

Bread! With Pictures!

Help in ordering bargain glasses?

Help in ordering bargain glasses?

Three unknown trees with berries

Three unknown trees with berries

my bedroom

my bedroom

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Flower Question