Werthead
Explorer
The OG 1E adventure series was a big headache.I think so. I did purchase some of these back in the day, but as a newbie DM could never understand how to really run them.
The 15th Anniversary Edition for 2E was quite good, and had more coverage for how to run the adventures with homebrewed PCs, even ones quite different to the assumed. Because it was just one book I think they pruned some of the material.
I am aware of the licensed 3E approach that broke the original campaign into three chunky, big modules but I don't know how successful that was.