Regarding the mushroom foraging - if you are not absolutely sure about them then it's generally not a good idea to pick mushrooms.
Yeah, I have been meaning to go with some locals who do it all the time. My in-laws used to go, but they sold their cottage in the forest this year, so they have chosen not to wander into the random forests. One of the cool things here is, collecting mushrooms and berries can be done anywhere, even on other people's property :)