Honestly, just go. Plan your route on a tablet app or paper map (sometimes a large paper map is easier to visualize the big picture of a long XC), check the weather and NOTAMs to verify or alter your planned route, then go. Make a flight log if you want to track your progress and track fuel consumption. Your nav instruments will get you there, and you will gain experience. There will come a day when you will need to divert due to winds aloft, adverse weather, or for a bio-break. Then, you will need to be able to find your way to your alternate destination without "pre-flying" in Google Earth or practicing the whole flight before you go. The more you take XC trips, the better you will get at it, and to be honest, it is part of the fun and challenge of flying. If long trips are intimidating, start with some short trips, then work your way up to maximum range. With panel-mount or portable GPS/EFBs, it is almost impossible to get lost these days.