I made cannabutter from my trim. I threw out the large fan leaves.
I dried it first, then ran it through the magic bullet to grind it up into a course powder. I think it mixes with the butter better for maximum absorption if it's ground up and it's hard to grind up if it's wet. So, to answer your question, I think you can use it wet, but would be better ground up and dry.
It has been said before, but bears repeating, be careful with the edibles. I made 2 cups of butter and used 1/2 cup to make cookies, then ate just 1 cookie. It got me higher than I have ever been, which was not fun. I was completely out of it.
However you eat it, start with an amount smaller than what you think will work and work up from there if you want more. The high from eating peaks at about 1 1/2 hours for me.