To break in new rings, (or glazed up bores) find a quiet straight road, get into top gear with low revs and accelerate up to high revs.
Change the oil after a few miles. Now, no labouring, extended idling or high revs for 500 miles. Change the oil again, it's false economy to extend oil changes.
If the engine starts first kick hot or cold (and doesn't leak a lot of oil)
you have done a good job of it and should be able to do a long trip with confidence.
As Black Sheep says, take a spare tube. And levers and patch kit and a pump. I take a tool kit with WW spanners, screwdrivers, pliers, duct tape and tie wire.
Log onto this forum if you breakdown, we are everywhere now and could assist you!
Take it easy and don't let them push you on the highways.
Finally, enjoy the trip.
Cheers Peter
PS A half chewed Mintie will seal up a leaking petrol tank!