my two cents.
First of all, you must tell your FI.
Scnd some advices.
a) Plan your flight with dedication, get a aeronautical chart where you can mesure the headings and the distances, and also get a good chart for visusal navigation, with all the small villages, heights, rivers, railway track represented, and drawn the planning along this chart.
b) Take the latest weather report and extract the wind in the altitude or FL you are going to fly, calculate drift angle with that. And note down in the chart, the wind vector , the true heading and the calculated heading with the know wind.
c) point firstly with the true heading (the heading extracted of the aeronautical chart +/- deviation) a take a big reference far from you, then fly the calculated heading true heading +/- drift angle. And pay attention if you are flying the track that you already drawed in the navigation map.
d) A good thing to do is split all the legs in 2 or 3 minuts sectors and drawn a mark each 2 or 3 minuts. And when you are flying check each mark and make sure you are in the correct track, think in 2 or 3 minuts the difference betwen the desired track and the actual track will be small enough.
e) Google earth could be a good help, check all the points in the google earth the day before the flight, and notice the trickiest things, the shape of the village, roads crossing, etc.
Have a nice flight