I'm inclined to agree on both accounts..
Although even some of the 'self-contained' requirements require you to go out of your way to complete.. Zoraidas 2 * Crystal Ball for instance mostly just means no Raven and a high mask drain if you try to get it early on. To a lesser extent Seamus' Face of Death and Lilith's Illusionary Forest - you wouldn't normally spend AP on those early on, at least not with the Master.
There's also some fairly easy 'enemy interaction' requirements, like Sonnias 10 Wd on enemy models.
But yes, as a general rule.. The easiest requirements are all in the 'self-contained' department and the most difficult ones in the 'enemy interaction'.