It's easy to install.
Put it in place so the springs hook where they should. The nub will hit the case somewhere in the area of the green line.
Slip the kicker on the shaft, just a bit so you can turn the shaft.
Using the kicker, turn the shaft counter-clock wise about 1/2 to 3/4 turn. As you do this push in on the shaft. When the nub clears the area of the green line and gets over the area of the red line it will slide right on into place. This preloads the return spring so the kicker returns to the up right position.
If the clutch pack is installed, you can test the kick start at this point. Once the shaft slides into place let it return to the upright position.
Now if you carefully move the kicker like you are trying to start the engine you will see the gears engage and then you will feel the resistance of the engine. Stop at this point and let the kicker return. You can try it a few times but don't try to hard or you might pull the shaft back out.
Once you confirm things are right, carefully slide the kicker off the shaft.
If your ready to install the cover you can, I like to put some grease on the shaft where the seal rides. This will help the cover slide on and not hurt the seal. It also helps when you remove that cover, the grease lets the cove slide off as you are holding the shaft in.
I see no need for a zip tie, that sounds like the hard way.
Leo