to avoid getting burned when helping someone on the forums, i either make sure
A) I am 98-100% correct on my answer because its in the manual, frequently talked about on forums, or ive personally experienced it.
B) If im somewhat sure, but not fully, i would add the quote "Im not 100% about this, please correct me if im wrong" at the bottom of the quote.
There is a problem that, newbies should always help, because they arent experienced, however they shouldnt be discouraged to post and help others if they wish.