How to set the timing accurately?

As I am not a mechanic, and my motor mechanic stays far away and left when we had a problem with a starter after he set the timing, and I had to get an auto-mechanic after the Christmas vacation to fix the starter and now the car is cranking and idling.

The motor mechanic once taught me that if the timing is set accurately the distributor must be at the center. But now to ignite the car the auto-electrician has put the distributor at the far end of clockwise corner if he brings it towards the center, it switches off. He said it requires a motor mechanic to fine tune the timing.

So, I want to fine tune the timing.

This is a Ford Ranger 2200 F2 Engine (petrol).