I am being embarrassed by being corrected since my reply is pretty unreliable
Perhaps, if you know that your reply might be unreliable, you could start your replies with something that lets the poster know that.
I do, if I know I'm not certain of the fix that is needed. I'm actually seriously concerned that someone could bork their computer by taking my advice, if it's not on target.
Something like ..."Well, I'm not sure - not expert at this - but you could try...."
After all, this is a forum to help users, and if you're a "want to help" (as we all were at some stage) that should be made clear.
Or in other words, don't learn how to help someone with their problem at their expense.