I just did this to mine. I assume you got the big *** red one that weighs about 150lbs? First off, make sure it fits onto a quick attach plate. Mine would not due to a gusset hitting the bottom edge of the QA plate on the bottom side, near the quick attach pin itself. I just cut part of this gusset off, along with about 50lbs of material in certain spots that I did not need due to weight. This thing is really overbuilt for a small(er) tractor and would be more for a skidsteer.
What I did was took a 4.5 inch cutoff wheel in my air cutoff tool and cut the welds for the ear to bucket connection. Depending on how yours is welded this may or may not be the best way. Mine was stich welded and the larger cutoff wheel allows you to slice very close to parallel to the bucket as possible to get the most weld off of it as you will be grinding this off later if you don't. After I got those cut off I ground down the back of the bucket flat and tacked on the QA plate where I thought it should be and left it at that. I slapped the QA adaptor onto the bucket and locked it in and then proceeded to pin on the bucket ears to the loader. From there I could drive the tractor up to the bucket and see where everything would line up and measured it centered and ended up tacking it on in a few spots so I could lift and articulate the bucket to make sure I had no issues, etc...
Getting the ears off the bucket were the worst part of it. Getting everything else setup and lined up right isn't too bad, but you really need to cut the ears off first and go from there. The only issue I had was my bucket isn't flat all the way down on the back and my cylinder dump stopper was forward of the point of a straight down cut. If you just have straight bucket ears all the way down you'll have a much easier time than I had.
I also cut off a lot of excess metal on the unit too. I even capped off the top (near the handle pivot) with the extra metal I cut off. If you would like picture I could get some for you tomorrow.