When providing therapy for a child with special needs, you have to be happy and fully attentive because a he/she can sense your feelings. Kids with autism have better emotional radars precisely because they have limited verbal ability and depend more on the tone and emotion of your voice (how you say it) rather than what you say.
Here is a short cut to happiness. This is posted just outside our son-rise door.
If you really want to achieve happiness, google Power Dialogues by Barry Neil “Bears” Kaufman. This tool helps parents with kids with autism tackle their personal issues first (and having special needs kids usually means having LOTS of personal issues) then empowers them to tackle autism and run and Son-Rise Program effectively.