It's absolutely fine. As Lexx says, Brits cope cope okay when driving in Europe, and that's a bigger adjustment as everything is backwards!
I've only ever driven the Hummer over in the U.K., but I've not had any issues not related to the size of the damn thing. The LHD aspect doesn't even factor into it when I'm driving it.
In your case, I'd be far more concerned about buying something that wasn't a rust bucket, that wasn't going to cost me a fortune to maintain, and that wasn't going to mean I'd have to wait ages for the parts to be imported. I'd also make sure I had a good specialist vaguely close by (50 mi), just in case