The only potential snag in the procedure is getting the timing correct. The tutorial at the end of the Beisan Anti-Rattle procedure is very good, but has to be modified for our Z cars. A thorough read of the procedure is hightly recommended.
I approcach the timing as a two part procedure. First is setting the timing of the engine and second is setting the Vanos timing. Getting the first part correct prevents valves from hitting pistons and the second part gets you full use of the Vanos.
Getting the engine timing correct is easy using the cam alignment tool and crankshaft locking pin. A is exhaust and E is intake.
Now for the second part - Vanos timing.
The general concept is to install the Vanos in the fully retarded position to match the cams which are also in the retarded position thanks to the cam alignment tool. The Vanos is in the fully retarded position when the Vanos pistons are fully inserted into their respective bores. On the E46 chassis, this is done on the workbench after the splined shafts are attached. Also, the oil flow regulator is installed. On our Z cars, the splined shafts and oil flow regulator are placed into the cylinder head prior to Vanos installation. Note the difference in the positions of the splined shafts in the next photos. (Photos borrowed from Beisan and show the E46 procedure).
To get the splined shafts installed into the sprocket hubs rotate the hubs clockwise to the stop. The slots in the timing gear sprocket allow the hub to rotate while the splined shafts are inserted. Insert the shafts to a midpoint position to allow room for the Vanos installation.
Install the Vanos.
Use the long solenoid bolts to support the Vanos during installation. Pull the Vanos pistons out slightly to access the 10mm nut so the unit can be fastened to the splined shafts. After the shafts and pistons are connected, fully insert the pistons back into the Vanos. To facilitate this, torque one of the hub bolts to prevent the hub from turning, then push on the Vanos until the pistons are fully seated. Loosen the hub bolt and fully insert the Vanos onto the cylinder head referencing the Beisan procedure.
At this point the sprocket hubs are in the correct position. My procedure for torquing the hub bolts differ from the Beisan procedure. After the Vanos is installed, torque the top hub bolts to lock the hub in position. Then fully remove the Vanos and torque the hub bolts with a torque wrench (14NM). The Beisan procedure has you torque the bolts by feel while the Vanos is installed. After the Vanos is removed (for the second time) the splined shafts should be in the same position as when you first started the procedure.
Don't forget to install the oil flow regulator for the final Vanos installation.
If you are just replacing Vanos seals and/or Vanos solenoid, timing is not an issue.