What I find most difficult:
- overcoming inert fears as part of the manifestation process, the deeper the desire, the deeper the fears to face seem to be
- letting go of the very desire, a lot of times it feels like clinging to the arrow instead of shooting it
- my mind not being in charge; not being able to see the How, to trace the process with logic, gives me the uneasy feeling of not being in control
- accepting the grandness of the Universe; watching a manifestation unfold often looks like seeing pigs fly to my logic.
Actually, there's a beautiful poem "Warning to Children" by Robert Graves which sums up rather nicely my mind's view on LoA.
Warning to Children by Robert Graves
I feel you really have to be very laid back about existence -best possible to a Buddha-like or devil-may-care-like degree- to make the most of LoA.