As far as the chin goes, there have been a few posts about holding the razor stationary and moving your chin and lip across it. That description sounds very very bad, so do a search for a more detailed discussion of the technique, as it works pretty well.

Having trouble shaving your left cheek with your right hand, eh? SWAP HANDS. Go ahead and get it over with early, before you get the feel of using one hand for your whole face. Since you have to teach yourself a set of motions to go through from scratch, they may as well be the correct ones. No need to go through it twice IMO.

Stay encouraged! It gets better, from what they say!