I quite quickly became a Douglas Adams nerd almost as badly - but nothing really compares to JRRT - as soon as I bought "Hitchhiker", "Restaurant" and "Life" in German translation in one raid on my favorite local bookstore. I then went on something of a "completist rampage" that kept the folks at said store on their toes - including one gaffe that made it necessary to re-visit the store to rectify (I kept the "wrong book" anyway). I'm still missing the book that Adams was most fervent about, the 1990 "Last Chance to See" co-authored with (zoologist and) photographer Mark Carwardine about endangered species. Not what his "fans" were expecting, to his disappointment.
I'm guessing that I have just now probably fallen into a typical nerd trap. You are reading the first book, which gave that entire fantasy cosmos its name? Not the following five, four of which Adams wrote himself, and the family-approved sixth volume "And Another Thing …" from 2009 written by Eoin Colfer (appropriately subtitled "Part Six of Three" - Adams himself had been making jokes when
books four and five had broken the "trilogy" mold - started by some obscure Oxford Professor whose tome actually
wasn't one …)