Two handy things that helped me sort out my DR navigation were
- having a ruler that had timings for different groundspeeds -
like this (but you can make your own)
- drawing a "wind star" to help with diversions - draw the 8 cardinal points in a star and mark the correction for drift if you want to fly that trick (i.e. +/- x degrees) and the groundspeed you'd have.
Than as mentioned break your legs up into 1/2s or even 1/4s and plog each leg separately. Draw on a 10 degree drift line. At each point see if you're off track and then you can double the track error to regain track in the same distance (if you're at the 1/4 way point and double the error, then you'll regain at the 1/2 way point).
Unfortunately you're not in the UK as there is a handy booklet going around from the Royal Institute of Navigation - many flying schools will probably have a copy.