Like most things in life, generalized questions can only be answered from the view of the person answering: 'What is their definition of hard/easy in reference to success/failure ?'
This BRSTV series is perfect timing. I've had a 30g AIO tank still in the box for my daughter for over a year.
I'll take the bait. I will use this video series to help with setup of tank and document my first build series on R2R.
I agree with @MT_is_a_Pisces in that it depends on how someone defines those terms. It can be time consuming in the beginning finding info. For me that was one of the hardest parts of the whole hobby - finding reliable information. These guides will definitely help with, what I believe to be, the hardest part of reef keeping. If you can find a mentor to share experiences with I believe the hobby becomes drastically easier to understand and join.