The procedure has been beat to death, but there are new folks coming along everyday. Somebody needs to write up a detailed procedure and post it as a sticky.
Anyway, short version: Take the cap off, pull the no. 1 sparkplug.
Put your finger over the sparkplug hole, bump the engine around while watching the timing marks on the crank if you can.
If not, don't worry about it for the first time.
When the compression blows your finger off the hole, stop and look at the dist. rotor.
It should be pointing somewhere close to the No. 1 position.
If its pointing exactly opposite, then your dist. is 180 degrees out and will have to be pulled.
At this point, look at the timing mark, and if its at 0 degrees (TDC), then you are in good shape.
Odds are, its going to be past it.
Carefully bump the engine around again until the TDC mark comes up the second time.
In other words, bump it past once, and stop it on the mark on the second trip.
The rotor should be really close to where it was when the pressure stroke hit on the spark plug hole.
With the timing pointer at 0 degrees, pull the dist. and spin the shaft around until its pointing at the no. 1 mark and reinstall.
Remember, the crank goes around twice for every one revolution of the dist.
