I LOVE book's, always have, always will. My bookshelves are literally overflowing. (I should buy another, but I hope to move home again in a few years...)
Guide books are a whole different story. My first step out of NZ was to Aus, relatively spontaneously - I had so much to do getting rid of most of my gear and storing a few special items ( eg book's) that the thought of a guidebook never even occurred to me. Spent 8 months touring around without one. Next stop England with 3 days notice - unmissable opportunity, long story.
Had no idea where to go or to stay once I hit London. I'd heard of Earls Court so that's where I headed and followed a backpack out of the station. Turned out to be a French guy and he knew where he was going to stay - we became good friends.
I did buy one for Europe but found that it was generally just a lot of dead weight other than the accommodation options. Got rid of it. I'd get one of those free local maps from wherever I was staying or nearby tourist info, mark my hostel, stick it in my back pocket and go for a walk. All day. Every day. I missed many famous sites but I also found lots of places that apparently the guide books didn't even mention. I found wonderful little bakeries, cafe's & restaurants by following locals; incredible little churches, bridges, icecream place's, picnic sites - you name it. At the end of the day I'd pull out the map and figure out where the heck I was and where I needed to go to get 'home'. Missed the last train in Paris once, it was a three hour walk.... .
So for the next 9 years that became my theme. I admit to missing having a guidebook in China though. Met an English woman on the Trans-Siberian railway and we were heading in roughly the same direction just via different places. We would arrange to meet every three-four days and every time we did I would avidly read her guidebook on the places I wished to go! Not so many tourists back then let alone English speakers. (Mind you I was a magnet for those! The Chinese - like everybody else - are a wonderful, welcoming people).
Fast forward to this year and my first Camino. Just the Inglès so rather short. No guide book, no map, no app - no problem. Had viewed a few YouTube videos though.
I did buy a very simple one to help me plan my stages for the Primitivo. The plan went out the window on day three because at Bodenaya I met some wonderful people that I walked with for the next couple of days - but hey that's what the camino is about right!
Except for the Verde Variant I just followed the arrows. To find that I followed the advice and guidance from here on the forum that some here very kindly gave.
No map, no app, no guidebook.
I have to admit to downloading mappy.cz now I'm back here in Germany, because with the project that I'm slowly working on - walking to Switzerland over the next couple of years - I'm finding that the camino/Jacob's Weg here is not very well marked. If at all sometimes. And my poor German reading skills put guide books a little out of contention. I also have a large map that shows all of the Caminos in Europe, for planning purposes.
I might have to consider a guidebook or at the very least Gronze for stage 2 if I ever get to it - Switzerland to Finisterre. Unless somebody knows a really good guide book in English? The winter is upon us, I'd love a good read!!!