Fara Shimbo's Crystalline Glazes book is by far the best I've found on the subject--and honestly it's one of the best books I've found on glaze chemistry in general. There are lots of books out there on crystals. Most of them cover one or two topics well: colors, firing schedule, glaze formula, application, process, reduction, catch disks and removal, etc. Shimbo's book covers it all with fantastic references for later, when you've got the process down.
A kiln with a controller helps immensely when you are first learning and if you plan to do long firing schedules. It also makes the process easily repeatable.
Electric kilns are great, but you end up having to replace your coils frequently if you take it to ^10 and hold, as is often required for crystals.
Most gas kilns don't come with controllers (they're expensive), so you have to do the firing manually. The zinc in the crystalline glaze volatilizes when introduced to a reducing atmosphere, so you have to keep the kiln in oxidation for the majority of the firing. Gas is great though, because there are no coils to replace and maintenance is next to nothing.
For the colors achieved in this video, you need to reduce after the growth period, on the way down. That means either firing in a gas kiln or setting up an oil drip for your electric kiln (which wears the coils down even faster).
Crystals are a fun process. They take commitment, but they are rewarding. Once you are familiar with firing a kiln, you should definitely give them a go.
The John Britt books are a good start for getting into making glazes, but they did little for my understanding of how clay and glazes actually function on a chemical/physical level.
I've had great difficulty finding books written for the studio potter which discuss what's actually happening during the firing.
Ceramic Science for the Potter is a bit cursory. If you're looking for a quick and dirty understanding it's not a bad start.
Fara Shimbo's books, Crystalline Glazes and Chemistry for the Crystallieri are probably the most replete. Though they focus on crystalline glazes, the principles can be applied broadly.
It's well out of date, but I enjoyed H H Stephenson's Ceramic Chemistry. It's written in 1912, but it discusses several topics in a very understandable manner that most authors just gloss over. You can read it for free on archive.org or purchase a physical copy off amazon.
Finally, it's expensive and unwieldly but The Potter's Dictionary has several really great entries on materials and techniques.