This is another one of those places where you need to make choices. Quite often what I do is use the starter. Provided of course the solenoid is accessible. Reach in and remove the wire from solenoid spade terminal. In its place slip on a piece of wire with a female spade terminal. A wire long enough to reach the battery positive post. Use that to bump the starter in small increments. I don't worry so much about crankshaft position. I look for a valve rocker arm that's down and adjust the valve next to it. Mark that rocker with soapstone and bump the starter again until a different rocker arm is down. Adjust the valve next to it. Mark that rocker arm and repeat until all the rockers are marked. Sometimes you can turn the engine in small steps by pulling on the fan blade while pushing in the belt somewhere. That works in some cases but not all. It's kind of hard on the fingers sometimes, but it works.
