I converted our 152 from McCauley's to Cleveland's many years ago and did the same last year on our 150M when it was in the shop for paint and a whole list of other items. Both of my Cleveland wheel and brake kits were sourced through Aircraft Spruce.
The job itself is rather straight forward and is basic mechanical work of unbolting the old and bolting on the new.
All the brake fluid will be drained so now will be the perfect time to remove the two brake master cylinders behind the rudder pedals so you can disassemble them, clean 'em up and replace the o-rings on the plunger shafts.
I would build stands to rest the axle shafts on while you're doing this work as that stabilizes the plane to the point it can't move while your doing all this work. Leaving it up on a jack is far to wobbly to do this kind of work.
Hope this helps a little.
BTW: You won't be disappointed with this conversion. I don't know what McCauley was thinking when they designed that 3 piece assembly.....POS if there ever was one.
