I did it in 1985 in my Robin. On the good side there was a bit more Avgas around in those days. On the other hand lack of GPS made it more interesting.
There was someone a few weeks ahead of me doing it in a Gypsy something or other.
Plenty of people have done it, it's not that difficult, it just takes time and money. Contacts help and make it more fun ... but a clearance agent and more money also do the job.
When I say money I mostly mean fuel and hotels. Though there will be the occasional nasty handling/flight clearance fee.