Watch the Safety altitudes in that part of the country.. and if the weather gets bad or looks bad ahead, don't be afraid to show good airmanship/decision making and say I am not comfortable carrying on on this route with the weather ahead. I plan to do XYZ.
He may say its OK carry on, or let you follow your plan. Either way it shows you are capable of making weather related decisions.
Pressonitis causes a lot of accidents.
Also you know you are going to be diverted so think through what actions you are going to take when it happens. Estimate bearing, turn on to new safe heading then line on a chart better estimate bearing and distance (end of thumb is 10nm). Refine heading, work out time on leg and look for waypoints en-route. You can then plan comms etc. Remember Aviate, Navigate, Communicate..
Don't forget your FREDA checks and finally, keep thinking what field could I get into if the engine failed. (because it will at some point in the day!!).
Try and enjoy it, relax and don't get flustered if you do something wrong.
Good Luck
Adie