For me, it basically goes like this:
"Alright, let's get some work done today."
"But I want to watch YouTube."
"But there's nothing new, and even if there is, you can watch it later."
"But I also want to play Smash."
"You can do that later"
"I want to read comics too."
"On Tapas or one of the books I bought?"
"Both."
"OK, you know what? You can do whatever you want until later this afternoon when we start working. OK?"
"OK."
And then on most days, the afternoon passes by, and I still haven't worked. Which is probably why I still haven't published my comic yet.