I'm in the "get another instructor" camp. A proper instructor will say "you have control" and mean it. That means no interference, no pushing, poking, adjusting, helping or what ever. If they want something done, they either ask you to do it or say "I have control" and after you have given them control, complete the task themselves. A good instructor will also have the confidence NOT to hover over the controls when you are flying.
As for your question regarding steering when landing, see if you can get this shown to you by an engineer - Press the tail down until you see the nosegear fully extend. Now move the nosewheel. It is disconnected from the steering and it can castor. It will be (well it should be) in this position when you first land which means that directional control is (and can only be) maintained by...
PM
(Remember what a crosswind will do to your aircraft... this should be covered in a briefing)
(...and don't forget what you should doing with the ailerons and control column after landing)