I'm sorry but you have misunderstood. Hawkeye's response is not sarcasm. It was good advice and there's no need to be offended by it. If you are needing more help than either of us has provided, simply say so. But I don't think this was meant to be any thing other than helpful.
It isn't sarcasm. Obviously you already know how to make a selection, and how to put the selection on it's own layer and how to add a layer effect. Thus the simplest and fastest way to find out if that will give you the desired result, is to just do it and see for yourself. Had you said you didn't know how to do something it would be completely different.
I followed the thread from the beginning, and Hawkeye's response did not seem sarcastic - in fact, it is sagely advise. While working on PS (or while programming), if a new idea appears in your mind on 'whether a particular tool/set of steps can be taken/used to achieve a desired output/effect', it is best to side step from what you are doing and implement it. That experimentation adds to your skills and to your repertoire. From my understanding, that is all he meant.