In many situations, to learn by doing is a best practice to acquire skill. Learning by doing develops problem solving skill and confidence that one can survive without instruction.
When large numbers of people learn a skill by doing, they have diverse approaches, make a variety of mistakes and can teach each other. When large numbers of people learn a skill by the same textbook, they all make the same mistakes and may not even recognize it.
Learning by doing is not appropriate when mistakes involve a substantial risk to others (e.g. operating a nuclear power facility, being Prime Minister).
In a wiki, learning by doing is the ideal method, because (unless you are an administrator) there is really nothing you can do that can't be undone - therefore the risk to others is minimal.
So, like, go for it.