This is a great idea which takes barely any effort at all!
All you need is a ladder (make sure it’s a solid one and not a weak/shaky one) and some wood planks. If you’re really ‘particular’ about it (I would be) – get a hammer and some nails and fix the wood planks onto the ladder.
Here are a few great examples of ladder shelves.
Check Out The Very Best Of Great Britain!
![Onetravel Guide Great Britain Travel Book Advert Banner](https://i0.wp.com/onetravelguide.info/wp-content/uploads/2022/04/Hand-Luggage-Only-Great-Britain-Travel-Book-Advert-Banner.jpg?resize=1000%2C1285&ssl=1)