You're mistaken on even this (personally aimed) point.  

The spiritual life - the interior life with God - isn't so much "tricky" (in it being particularly difficult to figure out) but rather that it's hard, & so it's not taken up in earnest by many people.

They seek the interior life for the wrong reason - for "consolation" or for "good feelings" rather than a more pure motive:

They stop their periods of prayer when it's dry, or "when I don't get something out of it".  

What if Jesus stopped His Crucifixion because "it was difficult" or because "He wasn't getting anything out of it.?

The interior life is quite simple, but it is hard.

But the Church gives many ways to help us build a lively interior life with God:  methods of prayer, great spiritual writing, the life of saints, and of course the incomparable grace handed to us in the Sacraments.

So many helps, so few takers up of the daily cross.   

The gate is, as Our Lord told us, narrow.