The phasing is pretty easy to set up if you do it mechanically. That method works but it is mechanically not optimal. You can fly it without any problems however, thousands of people do so.
Fit the rotor to the shaft and set up one link from bladegrip to swash.
Now shift the swashdriver, so the ball that is connected to the blade grip is having an angle of exactly 90 degrees to the shaft of that bladegrip.
To make it more clear: if the bladegrip concerned is pointing exactly sideways than the ball on the swash, connected to it should point exactly forward or aft..
Now set up your servo's as you would on a normal flybarred or FBL heli: if you push the stick forward, the swash should tilt forward, and if you push the stick to the left, the swash should tilt to the left.
The alternative way is setting the swashdriver so, that the control rods are as vertical as possible. Now you need to compensate for that in your transmitter with "virtual swash rotation". This is mechanically slightly better, but the difference is only so small, that I do not recommend it unless you know what you are doing (and in that case you wouldn't need to ask here