Help me learn self ballbusting

Hello everyone hope you are good
I'm a 26 gay slave
And I want to learn anything about ballbusting.
(Self-ballbusting)
Do you have any techniques.?
Some skills?
Something really good secret or experience to share how to?

Also I have hear about busting the cum out.
But it seems I can't do it.
Who long do you have to hit your balls?
Does it have to be tied?
Is there a trick?