There is an old Latvian custom that, upon returning from mushroom picking, the oldest person in the household tries them first. The reason being: they're probably the next to go anyway.
I'm surprised it hasn't allready happenend to you. Knowing wich ones you can eat is a verry good idea. Also you may want to wear gloves just to be on the safe side. I heard this kid tell a story about going to pick shrooms (to get high not to eat) and he forgot gloves as wound up passing out in a field for 2 or 3 days. I don't really belive it but it still might be a good idea. That Yellow one looks really nice.