I have the bigger one also and the MC adapter. I ended up making a new base for the MC adapter so it would be lower and I have better control when doing MC tires. I put a couple of new holes in the feet adjustments of the adapter so now I can work on tractor tires down to 8" wheels.
You can use soapy water as the tire lube and it works quite well or you can get a commercial product from most auto parts stores. After you break the bead before you try to remove the tire spray your tire lube in between the rim and tire all the way around.
When going back on with a tire, I use a tire lube paste, I will put lube on the edge of the rim and on the inside of the tire facing you. As you go on with the tire keep the bead in side the drop zone of the rim, it makes it a lot easier.
I also always remove the valve core when either repairing a tire or replacing one. When mounting a tubeless tire you have to remove the valve core or you won't get the beads to pop.
If using a tube make sure the tire does not have any hole or Big cracks where when the tire flexes it pinches the tube. If the tire does have a hole in it put a patch over the hole on the tire.
Plan on the first few time getting frustrated and struggling with the tire but as you do more of them it will get easier. Good luck!
PS: look on youtube and or go to the No mar tire changer site and watch some video's.