As others said - if you are not sure and there are enough answers from other monks then you probably shouldn't. But if you want to answer and you aren't sure, then say so in your posting. I've been reading and posting in perl forums and usenet for years, and I'm sure I have given wrong answers in that time (I hope not too many *cough*), but I usually try to make it clear in my postings when I'm only guessing.
There are types of questions where you can simply try out if your answer is correct, but there are many things also you cannot try because it depends on the system, on other software you don't have and so on.
There will be other monks reading your answer and perhaps they'll correct it. If you feel that you are corrected too often then think a bit longer before posting ;-)
In any case, try to get as sure as possible, and you will continue to learn, whether you answer or not.