It's big, it's a little bulky, and you definitely need the instructions to get the adhesive roll threaded in there, but it's not too difficult.
It takes some getting used to - from where you put it down, pulling the trigger and then letting go and lifting it up without leaving a string of adhesive.
The adhesive is VERY aggressive - more so than even our beloved Tacky Tape. So be careful when you position pictures, paper, etc. It's not moving once it goes down without seriously ripping some paper or even destroying it.
It isn't good for adhering smaller pieces of paper or embellis to LOs - use this for your bigger elements.
I'm so tickled with mine - worth the investment!