I agree with everything above.
FSX is quite good some things. Rather than echo RTN11's comments I'll merely add what I found useful.
IN FSX there is the capability to add varying winds (even real world winds if hooked up to the internet) which will provide useful practice at plogged timings for planned legs and unplanned diversions. Also if you know your next route to fly, it is useful for getting to grips with he direction of arrival and sometimes the layout of the aerodrome you're visiting.
Completely ignore the aircraft handling side of things, and as you are 30+ hours and into the nav phase you won't pick up bad habits.
Make the most of the sim, it can be very useful if used wisely.