Cessna
Welcome aboard mate - thanks for the post.
Firstly, with your PFL's - relax and fly the plane. Don't get caught up with your mayday or this and that, just put the carb heat on, and set the aircraft up for the glide. then, pick your field and dedicate yourself to it. Then, if you can, try a restart and send a Mayday. Your instructor will go through all this, and there is tonnes of literature on the stuff.
Navigation is very daunting at first, all the complicated processes you have to go through and planning etc - everyone gets this feeling when starting nav, including me - just have a look at my first nav exercise post (it was truly awful). You will pick up a hell of a lot of skills and you will look back in the future, and be proud of what you have learned.
Best wishes,
Lee
Data - I reckon the IMC will be my next venture too!