Mr L
This is no big deal!
but ....... it is a big adventure!
Just treat it as one nav after another, after another, after another ..... you get the idea.
Be well prepared.
Carry a good supply of water (in particular).
Carry an EPIRB (I carry 2 x EPIRBs and a Sat Phone when operating in remote areas).
Carry and use a GPS, but don't miss the opportunity to hone your nav and map reading skills. Every 30 min or so, fix your position based on the nav/map reading/heading holding skills that you have been taught - and then check it with the GPS. Try to know where you are on a line on the map at all times (can be hard in some of the more remote parts but you should still be able to work out where you should be based on 10nm intervals).
Safely operating a light aircraft is an exercise in risk management.
Be conservative in what you set out to do each day.
I don't know what sort of aircraft you plan to take but even in the Bonanza (with 5.25 endurance) I rarely plan more than 3-3.5 hr legs.
That said, I doing 6 hrs TL-ROM-CB tomorrow.
Maybe one long leg (3 - 3.5) or two smaller legs (1 - 2 hr) in a day is a good place to start.
If the weather looks crap - stay in the pub.
Hope you have a great trip - let us know how its going!
Cheers
Dr