To attempt or guess how to do s.t. (Has the idea of doing s.t. in the dark without really knowing what one is doing.)
Mag- and N- prefixes seem to be interchangeable. The -un imp. seems to focus on s.t. seen that you are trying to take a chance with as standing up to a bigger person in a fight. The -an imp. focuses on taking a chance or guessing with s.t. not immediately posing a threat to you.
This is what irritates me is attempting to eat in the dark.
I'm surprised how I correctly made a table when I was just guessing how to do it.
If you have a real strong desire to have a boat, just attempt to do it even though you don't know how to make one.