And although I've searched again, I still haven't located the heat gun. I googled making aglets, and read that someone suggested using a curling iron. I plugged mine in, turned it on to "turbo" and tried it on the shoelaces. And it was a bust! The aglets are no smaller. I have pulled the laces from Etsy until I can solve the problem. So, I guess I have four choices - either I break down and buy a heat gun, I search every nook and cranny until I find the gun Mary loaned me (which I need to find anyway), I find another way to make the aglets, or I chalk the shoelaces up to a very good idea that just didn't pan out.
Today is very gloomy, which probably is aided to my "bummed out" feeling. And as Annie says," The sun will come out tomorrow".