When preparing the nav I used to put 'ten mile markers' on each leg and then work out ETAs based on flight plan. I could then check off beside them how I was going and whether I was up or down on ground speed. Heading and time works if you know the wind but you will need to adapt that if the wind isn't as accurate as you would've liked. The ten mile markers also help you know more instinctively where you are on the map. (Hugh Jarse may be able to comment some more on that as he was one of the instructors at my school when I learnt that one.)
I assume that you've got a pencil notched with ten mile markers in them too? Always good for working out easily and quickly how far off track I am!
Lastly, a good instructor to teach you and practise, practise, practise!!!