Basically you imagine yourself going about and actually achieving the goal.
Something like, skip to 1:35
For me what i do, is I tell myself a nice story about what I'm trying to do but by referring to it as if it's about another person.
I know a friend of mine... who's trying to do crazy stuff bec... but he's struggling with... so he tried.... then he realized.... so he did ..... then finally it all became clear to him ..... then he got to action....
Something like that, if you want me to do a more clear sample email me email@example.com