I use this book
, which is much smaller and easier to hold than the various great horologions and such I've owned, but still has most of what you'd need anyway. (Some discussion
I'm not familiar with this particular book, but I've seen other similar "simplified horologions" before. One in particular replaced the troparia of the day's saint with those of the daily commemoration (Monday, the angels; Tuesday, John the Baptist; etc.), so that a calendar was not even necessary.
Whichever one you pick, it's not a bad idea to have one. The Hours are very nice services, only 10 minutes or so, and each focuses on a certain topic. The Sixth Hour is about Christ's crucifixion, for example. (But as always, it's better to pray less but consistently than to pray a lot and burn yourself out and not pray at all.)