You want to get your hands dirty as soon as you see the benefits of using Business Rule Framework to support rapid application development, assuring one version of the truth or handing over control of complex decision making to business analysist.
Apart from learning the capabilities of the tools, its data objects, expressions and rulesets, you also need to be able to translate business requirements into BRF+ functions.
You need the cultivate the talent to ask the business users whether their wish list actually matches what they really need. Just blindly accepting business requirements without scrutinising is a common mistake. This is the very reason why you should give the Business Rule Framework tool to business analysist instead of developers. The interaction between business analysts and business users is vital to reduce the deployment lead time for new of updated functionality.
Ideally the business analyst consumes the initial business requirements and build a prototype in a sandbox environment. This prototype has the purpose to verify the business requirements by simulating all known test scenarios, checking whether the supplied input returns the desired output. These sessions can be done with the business users, offering them to give instant feedback. After some iterations the prototype will satisfy all outcomes, offering the business users the trust that the final solution will offer the same result.
Building a prototype can be quite difficult. Even the apparent simple business requirement might end up in a complex configuration of BRF functions, because you need to apply modular design thinking. Consider that every BRF+ function will consist of little building blocks that could be re-used in other BRF+ functions.
This is where playing with Lego bricks is the ideal metaphor. When you build a Lego kit to build a car, the first sheets with instructions show steps how to connect bricks that do not seem to resemble a car at all. Eventually it transforms into the car you are expecting to see. Finally all pieces fit together and the final result is visible and in working order. The more complex the Lego constructions, like building the Star Wars Millennium Falcon, the more often you spend a lot of time assembling specific parts and losing the overall objective of the build.
You need to access your imagination how a business requirements can be realised by first identifying the smallest building blocks and how they would fit together to end up with a BRF+ function. It is like the business asking you to build a Lego house with doors, windows, rooms, levels and roof. You have all the necessary Lego bricks in all colours and sizes but you will decide where to start in building the final result. There will be trial and error along the way, which is sometimes frustrating. Often you will decide to start fresh and learn from the mistakes made in the previous prototype. The more often you do this exercise the more confident you will become in identifying the smaller building blocks and how they fit together to supply a working end result.
In the end you only learn the Business Rule Framework tool by having actual business requirements that need to be transformed into BRF+ functions. You will discover that the first few attempts will be hard, but eventually you get familiar with the capabilities and then you discover that BRF+ is able to offer solutions for all business requirements.