You don't need to buy Jepp or any other trip kits of transiting some country's airspace.
You need to buy the VFR charts and plan a route which is outside controlled airspace (CAS), and also plan a route which is more direct but which you can fly if you can get CAS transits.
Obviously, if you want to land somewhere, then you need the airport data, and you can get that from Jepp, from the national AIPs (links above), by contacting the airport, etc.
I used to do long VFR
trips like that before I got the IR. It's easy, once you collect all the stuff together. Airspace access is the least predictable factor, which is why a route outside CAS needs to be planned.
You might have to spend 100 euros plus on VFR charts...
Personally, I rarely bother to read the AIP. I just email/fax the airport directly for the info (opening hours, Customs, avgas, etc) and if they don't reply I don't fly there.
A good GPS is a must
