Plus 1
Most important thing, do not over complicate things. It’s a series of one day trips back to back, nothing more.
Get on bike
Head towards Turkey
When finished in Turkey turn 180 deg
Head towards uk.
Devote your time to a bit of admin and working out what you want to see en route and in country.
If you take all the advice on here......
A. You’ll end up going in 2043
B. Your wallet will be empty
C. Your bike will weigh 6.2 tonnes
Honestly, just go
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What he said +:
Once you've got some practice miles in and am confident riding again decide a maximum number of miles a day you'd be comfortable with (remember riding at 80mph all day on the French peage lets you cover lots of miles but going up and down a mountain pass will be significantly lower).
Decide if you wish to camp or hotel or have a mix. If its hotels then I'd suggest stopping by mid-afternoon to ensure you find one [if you haven't pre-booked as I don't]. (This is a sensible suggestion but I don't always follow it myself as I like to ride all day and stop before I get tired).
You may want to plan all your days point to point but weather can get in the way so be flexible and willing to deviate from a fixed plan if necessary.
Arrange a "spare" day every week for such instances or if you fancy a break or happen to stop at a place you really like and want to spend more time there.
As S92GS states: a bike tour is a series of one day events all tagged together so go, be careful, and have fun.
Final tip: if you need to stop (for a pee for example) and it's late or you're tired or you're in a hurry ALWAYS stop on your own side of the road! If you stop on the other side (UK) you'll possibly take off from this side into oncoming traffic. DAMHIK
Enjoy!