I actually don't find it too bad - I think it flows quite nicely! It's the Novice regionals test so it's used quite frequently.
I think the key to the whole test is having a good rhythm and keeping that throughout. The second medium trot is very short so make sure you go for it straight away but also make sure you can bring them back quickly as afterwards you have a 10m circle. In the walk to canter transition just make sure you have got a really purposeful walk and have left bend established. For the canter-trot-canter transitions make sure you practice these without solid walls against you if you know the test arena just has white boards inside a larger arena as it is very easy to lose the correct bend and get an incorrect strike off (almost think about riding shoulder fore and don't rush the upwards transition!) The final walk transition on the centre line comes up faster than you think, so make sure you are thinking about it before you even turn on to the centre line.
Good luck! We are also doing N39 this Sat at BCA as a practice for our first regionals the following weekend at Addington!