Don't despair; nav is hard when you first start!
Here's a top tip that acts like a 'gross error check': when you get to a turning point, turn onto your calculated HEADING but have a look along your TRACK, ie along the line that you've drawn on your map. That's obviously where you need the aircraft to be going. As you look along your TRACK, pick out an obvious feature away in the distance that you can use as a marker - this could be a distinctive hill, a chimney, a particular wood or something like that. As you fly along your drift-corrected HEADING, you should find that the aircraft is actually TRACKING towards the marker that you have chosen. If it isn't, then your wind correction is inaccurate, but you will then be able to make a reasonable correction to your DRIFT to take account of this.
Think this concept through carefully on the ground, especially with reference to a route marked on a map, until you are happy with it and then it should be easier to apply in the air.
E99