1) yep! you've got the idea. 2) fear landscapes, as far as I understand it (as someone who has also not read the books) are sort of a way of facing one or more fears in a more realistic way than just facing off with a boggart. there's a thread here that describes a fear landscape. 3) yes, it can be someone else's memory, if you have permission from the relevant player(s). and yes, it can be something different every day!