I do not know CakePHP. Is that a problem?
Not knowing CakePHP is not a problem if you are able to code with PHP. But expect some additional time to work yourself into the CakePHP framework (2-3 weeks). If you want to take up on a task and have never worked with CakePHP then now is the time to start getting familiar with it. The more you know, the easier and more fun it will be to do things in CakePHP!