Tricking Discussion - gainer tips please

i can do lots of tricks that are alot harder than gainers. im talking about either running or standing gainers.
but i cant gainer, i never have been able to. its like there is this mental block stoping me.
it is fear, but not just fear, somhow i just know i wont make it. even when im trying into a foam pit i feel like i wont make it into the pit.
i really anna learn them.  any tips on getting past this?

I learnt it by doing really slanted ones (the first few was actually horizontal, like strange stepover-hooks), slowly turning them into more and more vertical, real gainers.
Or you can try this method: