With power you really don't need to know much but I can understand why you would want to avoid it.
The Grices Maxims consists of 5 rules: The maxim of quantity: Which is saying the right amount for the context e.g How are you?
The maxim of relevance: Is saying what is relevant to the conservation e.g how are you? I'm good thanks. They responded with a relevant response.
The maxim of manner: Speaking in a clear and organised fashion.
The maxim of quality: Telling the truth.
Flouting the maxims occurs when the four rules above are broken for example with the maxim of relevance if somebody said how are you? And they responded with I've just fed the dogs. That is flouting the maxims.
If you need any more help with power stuff feel free to PM I'm really confident with the stuff and honestly you don't even have to write much power stuff in your essay. I only wrote about 3 theories in my mock exam and still got an A