Im trying change the shape of a jaw but I am having difficulty. Any tips?

It might help to model it extremely low poly, then use a subdivision surface modifier. Having less vertices to position makes the modeling process a lot easier. You can also use creases to make sharp edges without having to add extra edge loops.

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How do i make it lower poly? i know i can shade flat, but thats the only poly change im aware of at the moment since ive only been using blender for a week

Make a new object with a mirror modifier & turn on face snapping. You can trace your old one in edit mode. Usually, people call this process a method for retopology.