Dude.

Fully 100% complete? Perhaps not, but 90%, yes. 90% for something that's 65 million years old? That's wild! As for most skeletons that you see in a museum, yes they are far, far less complete and imagined based analysis of other bones that have been found.

You all right about the first "dinosaur" being discovered in the 1800s though. Whay did it takes a long? Because we didn't have that name until 1824. I think? Previously we just called them ancient lizards or giants or dragons like you are saying. This obviously changed as technology and science and understanding and more information became available. But these bones were definitely discovered throughout history.

I wanted to be a Paleontologist from the time I was able to talk until I was in high school, before I discovered computers. I could spell Tyrannosaurus Rex when I was 4 years old. Don't you make me break out my dinosaur t-shirt that I've had since that age that I passed on to my son and he wore several years ago!