Working has never been easy... But its always a satifaction...
From a comment a student gives u after u train him/her to the simple thanks someone gives you after ou do smoething...
Its very simple... Just look at work as a challenge, as something to make you learn more, to make you grow and enjoy it... Complaints dont bring u far... Negative thoughts bring u down so why think so much???
Just do your best at everything and end the day smiling knowing you have done your best and love the results...