Well I looked at your pics and the cookies are definitely very cute....so I wouldn't say you suck at all. I read at the bottom that your sticks fell out, next time just use royal icing on the tip of the stick and just stick those suckers back in
that's what I do. Just keep practicing and you will get the hang of it.
I hope this helps but my hands shake too, I do a lot of piping with royal icing, I find it helps me to hold my wrist slightly while I pipe with the other one.