There are 2 sides to this.
The initial setup takes a bit of time. Most of it is on the front hitch. The idler shaft needs to be installed, some brackets/guards mounted on the tractor proper, and mounting the chute and other accessories on the blower. More time consuming than anything else. Socket/combo wrenches are all that is needed. Usually the selling dealer will do much of it, but if not figure on 4 to 6 hours total.
Once the setup is done, mounting the blower is the other job. To attach the blower, you first install the front hitch. This requires removing the front brush guard and mounting the hitch to the front of the frame. To mount the hitch, no tools are required, but it is a bit heavy and a pain to handle and align to get it on. Once it is attached to the tractor, the blower attaches to the hitch by driving the nose of the hitch into the blower proper and flipping a latch handle. A PTO shaft is attached under the tractor, and another shaft is aligned between the hitch and blower. Getting the blower shaft aligned is a small pain, but not difficult. I (as well as others) made a dolly for the blower. Mine is from 2' x 4" x 1" ply, with 5 casters (4 corners and 1 in the middle for support). Using the dolly to hold the blower, you can easily move and store the blower, but it also makes aligning and hooking the blower to the tractor much, much easier. All in all it takes about an hour to mount the hitch and blower and have everything connected and ready to go.
paul